True or False 1. When an isolated conductor is moving in the direction perpendic

Question

True or False

1. When an isolated conductor is moving in the direction perpendicular to the B field, the free charges inside would receive a magnetic force F=qvB, which would move them along the conductor and accumulate them at the conductor’s end. The accumulated charge separation in the conductor would create an E field, hence a voltage difference |V|=EL, where L is the length of the conductor. When the E field force is strong enough to balance the magnetic force, qE=qvB, the equilibrium is reached. Hence, E=vB and the induced voltage difference between the two ends of the conductor is |V|=EL=vBL. It can function as a battery for a circuit. This voltage difference is called motion emf.

2. When a moving conductor is part of a circuit inside a B field, it functions as a battery; the induced emf is can be found by considering the flux change rate for the entire loop. This emf is fundamentally different from the motion emf mentioned above.

3. When a moving conductor is part of a circuit inside a B field, it functions as a battery; the induced emf is can be found by considering the flux change rate for the entire loop. This emf is exactly the same physics property of the motion emf mentioned above.

4. When a moving conductor is part of a circuit inside a B field, a current is induced in it and the conductor carrying this current would experience a magnetic force. This magnetic force may be in the same direction as the conductor’s motion or in the opposite direction as the motion.

5. When a moving conductor is part of a circuit inside a B field, a current is induced in it and the conductor carrying this current would experience a magnetic force. This magnetic force must be in the same direction as the conductor’s motion.

6. When a moving conductor is part of a circuit inside a B field, a current is induced in it and the conductor carrying this current would experience a magnetic force. This magnetic force must be opposite to the direction of the conductor’s motion.

7. For a coil consists of N loops in series, the induced ems if the same as that in one loop.

8. For a coil consists of N loops in series, the induced ems if the N times of that in one loop

9. The larger the magnetic flux through a loop is kept, the bigger emf is induced in the loop.

10. The fast the magnetic flux through a loop changes, the bigger emf is induced in the loop.

Explanation / Answer

6) True

as it is lenz law induced emf is in opposite direction

7) False

flux is same so each will have same voltage adding all will be N times of oneflux is same so each will have same voltage adding all will be N times of one

9) True

as e = d phi / dt and phi = BA

10) True

as e = d phi / dt and phi = BA

8) True

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