The figures below show two different situations where a current may be induced i

Question

The figures below show two different situations where a current may be induced in a loop according to Faraday's Law, with the direction given by Lenz' Law. The magnetic field is shown by the x's in Fig. 2. Select true or false for the current in the loop. (The compass directions are defined in the usual way.)

fig1: Magnet moving West, induced current 'a'.

fig2: Loop moving East, induced current 'b'.

fig1: Loop moving West, induced current 'a'.

fig1: Magnet moving East, induced current 'a'.

fig2: Loop moving North, induced current 'b'.

fig2: Loop moving South, no induced current.

Explanation / Answer

A) ?g1: Loop moving West, induced current ‘a’.

True. The loop is moving into an area of lesser magnetic ?eld, and is going to compensate by induc-ing a current in the a direction.

B) ?g2: Loop moving East, induced current ‘b’.

True. The loop is moving into an area of lesser magnetic ?eld, and is going to compen-sate by inducing a current in the b direction.

C) ?g1: Magnet moving West, induced current ‘a’.

False. The induced current would be in the b direction.

D) ?g1: Magnet moving East, induced current ‘a’.

True. The loop is moving into an area of lesser magnetic ?eld, and is going to compensate by induc-ing a current in the a direction.

E) ?g2: Loop moving North, induced current ‘b’.

False. There is no induced current, as the magnetic ?eld is constant from N to S.

F) ?g2: Loop moving South, no induced current.

True.

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