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 North, induced current 'b'. fig2: Loop moving South, no induced current. fig2: Loop moving East, induced current 'b'. fig 1: Magnet moving East, induced current 'a'. fig1: Loop moving West, induced current 'a'. fig1: Magnet moving West, induced current 'a'.

Explanation / Answer

1) false

true if the magnetic field is not continuous. since the loop is leaving the magnetic field, there will be a decrease in

magnetic field which will cause a decrease in magnetic flux. therefore, the induced current direction will be the

same.

false if the magnetic field is continus. since there is no change in the magnetic field, there will be no change in

magnetic flux. therefore, there is no induced current.

2) true

false if the magnetic field is not continuous. since the loop is leaving the magnetic field, there will be a decrease in

magnetic field which will cause a decrease in magnetic flux. therefore, the induced current direction will be the

same.

true if the magnetic field is continus. since there is no change in the magnetic field, there will be no change in

magnetic flux. therefore, there is no induced current.

3) true

true. since the loop is moving east and there is a drop in magnetic field which will cause a decrease in magnetic

flux. therefore, the induced current direction will be the same.

4) true

true. since the magnet is moving east and there will be a drop in magnetic field which will cause a decrease in

magnetic flux. therefore, the induced current direction will be the same as "a".

5) true

true. since the loop is moving west and there will be a drop in magnetic field which will cause a decrease in

magnetic flux. therefore, the induced current direction will be the same.

6) false

false. since the magnet is moving west and there will be an increase in magnetic field which will cause a increase

in magnetic flux. therefore, the induced current direction will be the opposite.

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