TB_chapter19 - Chapter 19 Magnetism CHAPTER 19 Conceptual...

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Chapter 19, Magnetism C HAPTER 19 Conceptual Questions C1. A square coil and a triangular coil each have sides of length L . The triangular coil has twice as many turns as the square coil. If a the same current is sent through each coil, when the coils are placed in the same uniform magnetic field making an angle of 30 ° with the planes of the coils, which coil experiences the greater torque? a. the square coil b. the triangular coil c. Both coils experience the same torque. d. It depends on the magnitude of the magnetic field that the coils are placed in. C2. Two parallel wires carry the a current I in the same direction. Midway between these wires is a third wire, also parallel to the other two, which carries a current 0.5 I , but in the direction opposite from the first two wires. In which direction are the net forces on the outer wires? a. Since the net forces are zero, there is no direction. b. Both forces are toward the center wire. c. Both forces are away from the center wire. d. Both forces on the two wires are in the same direction in space. C3. Square coil A has 2 N turns and sides of length L , and square coil B has N turns and sides of length 2 L . When a current of 2 amps is sent through coil A and a current of 1 amp is sent through coil B, which coil has the greater magnetic moment? a. coil A b. coil B c. Both have the same magnetic moment. d. More information is needed. C4. Solenoid #1 has a length L , cross-sectional area A , and N turns. Solenoid #2 has a length 2 L , cross-sectional area 2 A , and 2 N turns. Which solenoid has the greater magnetic field at its center when equal currents are going through them? a. #1 b. #2 c. Both have the same magnetic field. d. Since it depends on the values of A and L , none of the above are correct. C5. A beam of electrons is sent in the positive x -direction in a region with a uniform magnetic field B in the positive y -direction and a uniform electric field E in the positive z -direction. At which of the following speeds would the electrons be deflected in the positive z - direction? a. v < E/B b. v = E/B c. v > E/B d. There is no speed for which this will happen. 19.1 Magnets 68
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Chapter 19, Magnetism 1. Electrical charges and magnetic poles have many similarities, but one difference is: a. opposite magnetic poles repel. b. one magnetic pole cannot create magnetic poles in other materials. c. a magnetic pole cannot be isolated. d. magnetic poles do not produce magnetic fields. 2. A soft magnetic material has which property? a. It cannot be magnetized. b. It is easy to magnetize. c. It is hard to magnetize. d. It attracts slowly moving charges. 3. Which of the following is not a hard magnetic material? a. iron
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This note was uploaded on 01/06/2012 for the course PHYS 201 taught by Professor Coffin during the Spring '09 term at Oregon State.

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TB_chapter19 - Chapter 19 Magnetism CHAPTER 19 Conceptual...

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