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 by Faraday's Law, with the direction determined by Lenz' Law. The magnetic field is shown by the x's in Fig. 2. Choose true or false for each statement for the current in the loop. (The compass directions are defined in the usual way.) IN S ig fig 2. fig2: Loop moving North, no induced current fig2: Loop moving South, no induced current fig2: Loop moving East, induced current b fig2: Loop moving North, induced current a fig2: Loop moving South, induced current b fig2: Loop moving West, induced current a

Explanation / Answer

1) True -- because field doesn't change while moving to north, so flux doesn't change and hence no emf is induced which means no current induced.

2) True -- because field doesn't change while moving to south, so flux doesn't change and hence no emf is induced which means no current induced.

3) True -- When loop moves to east, field decreases and hence flux decreases and so emf will be induced which will cause a current in such a direction so as to strengthen the weakening flux. so current must be clockwise, i.e., current b.

4) False -- We have established in 1) that loo moving North induces no current.

5) False -- We have established in 2) that loo moving South induces no current.

6) True -- When loop moves to west, field increases and hence flux increases and so emf will be induced which will cause a current in such a direction so as to weaken the increasing flux. so current must be counterclockwise, i.e., current a.

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