Question 1
The diagram shows a bar magnet and a coil of wire. The bar magnet is moved at the same speed in each experiment.
In which situation is the largest electromotive force (e.m.f.) induced?
A
B
C
moves left at same speed as bar magnet
D
Question 2
When a conductor in a complete circuit cuts across a magnetic field, a current is induced in the conductor.
Which statement about the induced current is correct?
A
The induced current is in the same direction as the motion of the conductor.
B
The induced current is in the opposite direction to the motion of the conductor.
C
The direction of the induced current is in the same direction as the magnetic field.
D
The direction of the induced current opposes the change causing it.
Question 3
A piece of soft iron XY has a coil of wire wound round it.
The N pole of a bar magnet is pulled away from end X which causes an induced current in the coil.
The magnet is now turned round so that the N pole is on the left. It is taken to the other end of the soft iron and the N pole is pushed towards end Y . A new current is induced in the coil.
Which statement is correct?
A
The new induced current is in the opposite direction and causes the soft iron to attract the N pole.
B
The new induced current is in the opposite direction and causes the soft iron to repel the N pole.
C
The new induced current is in the same direction and causes the soft iron to attract the N pole.
D
The new induced current is in the same direction and causes the soft iron to repel the N pole.
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