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.) fig2: Loop moving South, no induced current. fig1: Loop moving West, induced current 'a' fig1: Magnet moving East, induced current a fig1: Magnet moving West, induced current 'a' fig2: Loop moving East, induced current 'b'. fig2: Loop moving North, induced current 'b'.

Explanation / Answer

According to the given problem,

1.) True: Since the flux is not changing through the loop, there is no induced
current.

2.) True, if the loop moves west, the same principle as the magnet moving east
applies.if the magnet is moving east, less flux will travel through the loop.
Thus, the induced current will be such as to gain flux. Using the right hand rule,
more flux will be in the loop if current travels in the direction indicated by ’a’.

3.) True, if the magnet is moving east, less flux will travel through the loop.
Thus, the induced current will be such as to gain flux. Using the right hand rule,
more flux will be in the loop if current travels in the direction indicated by ’a’.

4.) False,if the magnet is moving east, less flux will travel through the loop.
Thus, the induced current will be such as to gain flux. Using the right hand rule,
more flux will be in the loop if current travels in the direction indicated by ’a’.

5.) True, since the loop is moving into a region of lesser magnetic field, the induced
current will be such as to oppose that change; that is, to increase the flux.
Using the right hand rule, the current will flow in the direction indicated by ’b’.

6.) False, since the flux is not changing through the loop, there is no induced
current.

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