# Magnetic Field Questions And Answers Pdf

This difference in speed is called slip. The pictorial representation of magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Exam Midterm June 2015, Answers. How is a current carrying wire placed in a magnetic field so that magnetic field does not act on it? [A] Parallel to the magnetic field [B] Perpendicular to the magnetic field [C] Making angle of 40° with magnetic field [D] Can be arranged any way. The wrong answer penalty is 2% per part. Prediction 1 (answer on the tear-sheet at the end!!): From our expression in equation (10. Basically, it uses a conductor that is wound into a coil, and when electricity flows into the coil from the left to the right, this will generate a magnetic field in the clockwise direction. Magnets and Magnetic Fields Instructions and answers for teachers. Sample answer: An electromagnet could be. When a rectangular coil is placed in a magnetic field and current is passed through it, a force acts on the coil which rotates it continuously. In other words, the magnetic field (), is equal to a constant times the current divided by the circumference of the magnetic field it is creating. B=Magnetic field A= Area of loop In power industry, voltage is generated by rotating coils in fixed magnetic field as shown in the picture. Now you asked about why magnetic field lines bend -- they don't always have to. investigate, in qualitative and quantitative terms, gravitational, electric, and magnetic fields, and solve related problems; D3. where ε is the induced emf, N is the number of turns of coil, ΔΦ is the change in magnetic flux, and Δt is the duration of the change. Although in. Magnetic field and force Clicker Question Answer: The (+) particle is moving anti-parallel to the B-field. Data Sheet Earth’s Magnetic Field #3. Lab 7: Magnetic fields and forces Lab Worksheet Name_____ This sheet is the lab document your TA will use to score your lab. RADIOACTIVITY (2011;2) (a) Three sources of radiation are shown. Q1) What must the current in the coil be if the magnetic field at the center of the coil is 5. Quiz & Worksheet - Lab on Magnetic Fields Quiz questions will. The rotation of earth causes a dynamo effect in the iron inducing currents and that is the reason for magnetic field. When the strength of a magnetic field is measured along the lineAB, it is found to vary as shown in Fig. Some questions must be answered with a cross in a box. It is the magnetic field that creates the force (a push or a pull) on other magnets or magnetic materials in the field. 0 V - + Final Practice examination Key 7 of 39. This results in a magnetic material, but one with a weak net magnetic field. on the direction of the magnetic ﬁeld at that point only. A current flows as shown and a magnetic field is produced. The compass needle will line up. 1) What is the macroscopic magnetization? Draw the scheme. providing answers to. Indicate the direction of the magnetic field at points near the path, assuming the path is always in the plane of the page, and indicate the relative magnitudes of the field in each region. Concept Questions Review Concept Questions with Answers 8. 5 What is Electrical Transformer? Ans: Electrical transformer is a static device which transforms electrical energy from one circuit to another without any direct electrical connection. subtle changes in magnetic fields and. Magnetic objects placed within a magnetic field would be affected in two ways: a magnetic material would always be attracted to the magnet, whereas another magnet could be attracted or repelled. a) The flowing current produces a magnetic field. The magnetic field density is a vector. The angle θis 180 and the force is FB=qvB sinθ= 0. In this experiment we studied magnetic fields and learned how to predict the direction of the magnetic force on a moving charge. If a material that can be magnetized is placed into this field, it will become magnetic. The circles below represent compasses. Ask us about other programs that meet regional curriculum requirements. Why does the compass needle normally point North? 2. Electromagnetism and magnetic field quiz questions and answers pdf, strength of magnetic field is known as, to practice for physics certifications. This is just the current going round the loop times by , this is because, as said in Stuff Moving, if you have a moving charge i. • David Jiles Introduction to Magnetism and Magnetic Materials, Chapman and Hall 1991; 1997 A detailed introduction, written in a question and answer format. Who is the primary contractor for the TR-3B? Lockheed, Boeing, Northrup, Teledyne Ryan, managed by NRO, NSA, and CIA. A particle with a positive charge of q = 1. parallel currents that repel 3. The magnetic field gets weaker as you get farther and farther away from a magnet; so magnets can be very strong up close, but they do not have much of an effect on objects (like other magnets) that are very far away. pdf - Download as PDF File (. The force acts in a (sideways) direction perpendicular to both the velocity and the magnetic field. Solution: From FBIL= sinθ, the magnetic field is 3 0. 7 Lenz's law 2 O Thc induced field nccds to point up ward to the c hang e in SOLVE FIGURE A ccw current induces an upward magnetic field. shut off; that is the magnetic particles are on the part when residual (remaining) magnetic field is present. Before answering a multiple choice question read the stem and all of the options. Magnetic fields are usually measured in microteslas (µT) or nanoteslas (nT). So your magnetic field around a loop is just equal to the changing E field going through it times by , but then you have to add on a bit. The early Greeks knew about magnetism as early as 800 B. Suppose that an electromagnet uses a coil 1. ÎPostponing until Chapter 29 the questions of how magnetic field is So the answer is D, not E. Sample answer: An electromagnet could be. I've read that even "non-magnetic" things, like the human body, a tree, a piece of plastic, and anything else, all have extremely weak magnetic fields surrounding them. Identify any disagreements or problems. Activity Questions: 1. Without our planet's magnetic field, Earth would be subjected to more cosmic radiation. Hopefully these short answers will help you with the theoretical questions. The magnetic field in the center of that thing will be zero, but magnetic field lines will point in towards the center from the left and right, and field lines will point away from the center up and down. Transformer quiz questions and answers, in transformer primary coil is connected to, with answers for physics certifications. The diagrams show the loop entering the magnetic field. In fact, diamagnetic substances are weakly repelled by a magnetic fieldas demonstrated with the pyrolytic carbon sheet in Figure \(\PageIndex{2}\). the stator magnetic field. Multiple Choice Questions Electric Field (b) Magnetic Field (c) Wave propagation (d) The emf induced by the wave 5. The tendency of the field. A current flows as shown and a magnetic field is produced. Faraday's law states that whenever the magnetic flux through an area changes, there will be an emf induced in the perimeter of the area (or equivalently there will be an electric field induced at the perimeter of the area). In electromagnetic theory, the electric and magnetic phenomena are related to each other. We asses the magnetic field inside the toroid using the formula for the magnetic field in a solenoid because a toroid is in fact a solenoid whose ends are bent together to form a hollow ring. Well, we are not talking about the question related to your personal life. shut off; that is the magnetic particles are on the part when residual (remaining) magnetic field is present. Therefore, the dimensions of electric and magnetic quantities must also be related to each other. Booklet of questions were compiled from past paper questions from 2002 - 2009 from old scheme (This is a work in progress!):. Use the exact values you record for your data to make later calculations. The wires are parallel to the z-axis, and are each a distance aaway from the z-axis as shown in the gure. Faraday's Law of Induction 10. Although in. Electromagnetic Waves Assignment is due at 2:00am on Wednesday, March 28, 2007 Credit for problems submitted late will decrease to 0% after the deadline has passed. Tech/ BE Students. A circular loop of wire is in a region of spatially uniform magnetic ﬁeld. Answer: Properties of the magnetic field lines:. • Show all the steps in any calculations and state the units. - The tangent of the field line at any point - The tangent of the field line at any point indicates the E field direction indicates the B field direction Sample field lines: Sample field lines: note the right-hand rule - Uniform E field inside a parallel-plate - Uniform B field inside an ideal solenoid capacitor (inductor). Magnetostatics - Electronic Engineering (MCQ) questions & answers Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Magnetostatics 1) If a conductor with length of 5m is located along z-direction with a current of about 3A in a z direction & B = 0. (2011 test - question 3) a. Question 2 What is the principle of an electric motor ? [CBSE 2018] Answer: A motor works on the principle of magnetic effect of current. The rotor will constantly be turning to align its magnetic field with that of the stator field. the magnetic ﬁeld lines in two and three dimensions. If you move the compass, the needle will twist to line up with Earth’s magnetic field. GCSE PHYSICS ELECTROMAGNETISM ANSWERS AND MARK SCHEMES QUESTIONSHEET 16 (a)(soft) iron 1 (b) links magnetic fields to coil1 (c) induced voltage only if relative movement or magnetic field changes 1 ac means magnetic field changes direction therefore ac in primary induces ac in secondary 3 TOTAL / 5 QUESTIONSHEET 17. Answer: We must, first of all, calculate the magnetic flux linking the coil. Turning the plane of the loop to be parallel to the magnetic field C. (702) 257-MAD1 www. There is a magnetic field in the region between the two plates pointing towards the right. on the magnetic ﬁeld, the charge of the particle and the velocity of the bar magnet only. questions on electromagnetic induction important for interview including Lenz law, difference between AC & DC, flux and field, EMI, Transformer with answers. The magnetic field lines originate from the north pole of a magnet and end at its south pole. an iron nail c. Give the relation between magnetic flux density and magnetic field intensity. According to their interaction with a magnetic field, materials can be classified as: Diamagnetic materials which have a weak, negative susceptibility to magnetic fields. Unit of B is Tesla. The answer is that a moving electric or magnetic field produces the other type of field, i. \$If\$ you\$ look\$ up\$the\$ permeability\$ constant in\$ a\$ reference,\$ you\$ may\$ find\$ it listed\$ in\$ units\$ of\$. This causes the magnetic fields of the electrons to cancel out; thus there is no net magnetic moment, and the atom cannot be attracted into a magnetic field. Oersted law and his Experiment are the most important 5 marks question which is the most frequently asked in the previous year paper. Which of the following situations is not true for magnets? a. the field current. The force between two charges is 120 N. It is rotating with Earth. 2 Electric Fields;. Ask us about other programs that meet regional curriculum requirements. Fill the appropriate circle completely like this , for answering the particular question, with Black ink ball point pen only, in the OMR Answer. The angle θis 180 and the force is FB=qvB sinθ= 0. has a unique magnetic field. Like poles repel each other. There are 6 problems worth 100 points: Problem #1 - 10 pts Problem #2 - 20 pts Problem #3 - 30 pts Problem #4 - 15 pts Problem #5 - 10 pts Problem #6 - 15 pts All answers should be in terms of the variables explicitly listed by the statement of the problem. N S Problem: A small bicycle generator has 150 turns of wire in a circular coil of radius 1. If the number of turns in the circular coil is doubled, the field produced. complexes and thus the magnetic moment would be close to 7. Happy hunting! What is Electricity? Electrical Circuits Conductors Electric Fields Magnetic Fields Conductors & Insulators What is a Magnet? How Electromagnets Work Electromagnets Short Answer 1. Magnetic field lines always start at a north pole and finish on a south pole. Now you asked about why magnetic field lines bend -- they don’t always have to. Discuss how much difficulty the Earth’s magnetic field will. All Chapter 13 - Magnetic Effects of Electric Current Exercise Questions with Solutions to help you to revise complete Syllabus and Score More marks. The magnetic field in the center of that thing will be zero, but magnetic field lines will point in towards the center from the left and right, and field lines will point away from the center up and down. Notice how the force/magnetic field lines point away from the magnet's North pole and toward its South pole. An ideal solenoid has a current I flowing through it, up in front and down in back, as shown above. Electricity and Magnetism Internet Scavenger Hunt Use these websites to answer the following questions. The answer lies in magnetic fields of force. Magnetic Fields 905 any historians of science believe that the compass, which uses a magnetic needle, was used in China as early as the 13th century B. Questions & answers on magnetism. I=Current A=Area. 2 V, what is the. (OpenStax 22. The conductor experiences a magnetic force per unit length of 0. This Checkpoint Task should be used in conjunction with the KS3–KS4 GCSE (9–1) Gateway Combined Sicence A Transition Guide – Magnets and Magnetic Fields. Questions and Answers about Biological Effects and Potential Hazards of Radiofrequency Electromagnetic Fields Authors Robert F. The magnetic field in the center of that thing will be zero, but magnetic field lines will point in towards the center from the left and right, and field lines will point away from the center up and down. State two ways in which the magnetic field could be detected. In electromagnetic theory, the electric and magnetic phenomena are related to each other. The mass of the electron is m and the charge has magnitude e. There is no material that will block magnetism. This will often result in having to choose between two possible options. 1 shows the magnetic field between the two pole pieces of a large U-shaped magnet, with the north pole vertically above the south pole. Any electric current does generate a magnetic field, but it might be a very weak magnetic. When you take the test, you will mark your answers on a separate machine-scorable answer sheet. Notice how the force/magnetic field lines point away from the magnet’s North pole and toward its South pole. 2m in diameter made from square copper wire 1. The needle of a compass is a magnet. Chapter 28: Magnetic Fields. "EMF Electric and Magnetic Fields Associated With the Use of Electric Power - Questions and Answers Booklet (2002)" 22. semiconductor theory 1 47. 46 x 10 28 electrons/m 3 and the plane of the bar is rotated to be perpendicular to the direction of B. If the number of turns in the circular coil is doubled, the field produced. To understand the force that a magnetic field exerts on a moving charge. Why does the magnet change the compass? 3. completing the answer sheets are on the answer sheet. 1 of 2 ES 2 Sanders-Fleming Magnetic Field Video E in Apace 2:48 PM 10/30/14 Earth in Space. 1 Magnetic Fields; 1. Electric fields are produced by the presence of electrical charges, and magnetic fields are produced by the movement of those charges. The power supply produces 120 V at a maximum power output of 4. none of the above. opposite currents that attract. Magnetic fields are usually measured in microteslas (µT) or nanoteslas (nT). providing answers to. Engineering Interview Questions and Answers, Engineering Multiple choice pdf for Freshers and experienced. 0 x 10^22 A m^-1. Magnetic Field of a Solenoid Page 4 Pre:Lab)Questions) 1. Answer: Yes. The further apart the lines are, the weaker the field is. showing polar wander and magnetic changes, and answer questions about quantitative aspects of these changes. Students repeat 5 and 6 until all points have been marked with an arrow for the magnetic field direction. (D) Alpha particle moving. Calculate the magnitude and direction of the resultant magnetic field at point P. College physics objective questions and answers on Kirchhoff law, laser in physics, law of conservation of angular momentum, logic gates, magnetic field, magnetic flux density, magnitude of a vector, metric system conversions, Millikan experiment, modern physics, moment of inertia, momentum in physics, newtons laws of motion, non conventional. On the diagrams, draw arrows to show the path of each type of radiation as it passes through the magnetic field. Conversely a moving charge induces a magnetic field. 12 Problem 32. 12 N/m in the negative y direction. Question 1 If the current in a wire is flowing in the vertically downward direction and a magnetic field is Download this as pdf. The angle θis 180 and the force is FB=qvB sinθ= 0. A charged particle of mass m and charge q enters a magnetic field B of flux density 0. Magnetic objects placed within a magnetic field would be affected in two ways: a magnetic material would always be attracted to the magnet, whereas another magnet could be attracted or repelled. What is Charge? magnetic field induces a current Questions & Answers. Klein, Radiological Centre – Ev. To understand the force that a magnetic field exerts on a moving charge. Why Electronics Magnetism and Electromagnetism? In this section you can learn and practice Electronics Questions based on "Magnetism and Electromagnetism" and improve your skills in order to face the interview, competitive examination and various entrance test (CAT, GATE, GRE, MAT, Bank Exam, Railway Exam etc. The force acts in a (sideways) direction perpendicular to both the velocity and the magnetic field. State the observation made by Oersted on the basis of his experiment with current carrying conductors. N S Problem: A small bicycle generator has 150 turns of wire in a circular coil of radius 1. Question-34 What are magnetic field lines? How is the direction of a magnetic field at a point determined? Mention two important properties of the magnetic field lines. Quick Note on Magnetic Fields Like the electric field, the magnetic field is a Vector, having both direction and magnitude We denote the magnetic field with the symbol B r The unit for the magnetic field is the tesla 1tesla =1T =1N / A⋅m There is another unit that is also used and that is the gauss 1 gauss =10−4T. complexes and thus the magnetic moment would be close to 7. apart, as shown in Fig. Magnetic Fields A magnetic field can exist only with two opposite and equal poles. To understand the force that a magnetic field exerts on a moving charge. Sample answer: An electromagnet could be. Since we're told that the particle is traveling in a magnetic field, it would make sense that this particle is going to be affected by a magnetic force. YES! Now is the time to redefine your true self using Slader's free University Physics answers. 'Magnets and Magnetic Fields' Checkpoint Task supporting PowerPoint. Name the type of current: (a) used in household supply. The Earth’s magnetic field is approximately 0. Magnetic Flux B A Area φ == A magnetic field induces a force on a stationary charge. These sources emit radiation into a magnetic field that is directed into the page. The exact dependence of the magnetic field strength B on radial distance from the wire R is B = μ o I / 2πR where μ o is the permeability of free space and has a value of 4π x. out of the page. including questions about magnetic field reversal and its. AP Physics 2 Magnetic Field Multiple Choice 1.   