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 strength in Figure 2 is represented by the dens ty of dots. Select true or false for the current in the lcop. The cardinal directions are as defined in the compass rose. s out of page Fig. 1 Fig. 2 7 Fig 1: Magnet moving East, induced current 'a . Fig 2: Loop moving North, induced current , Fig 1: Loop moving west, induced current 'b Fig 2: Loop moving South, no induced current. Fig 2: Loop moving West, induced current 'a Fig 1: Magnet moving west, induced current a".

Explanation / Answer

In all cases, incuded current is such as to oppose the change in magnetic field, according to the lenz law. So,

Magnet moving east in 1. , flux through loop is decreased and current is such as to increase this flux. So, induced current is 'a'.

Loop moving north in 2. , flux through loop is not changed as field in same everywhere from the fig. So, there is no induced current.

Loop moving west in 1. , flux through it is again decreased and a current 'b' is induced.

Loop moving south in 2. , no change in flux and no induced current.

Loop moving west in 2. , flux is increased as it is moving to region with more field lines. So, incuded current is such as to oppose this change , and is in direction b.

Magnet moving west in 1. , flux through loop is increased and to oppose this, induced current is a.

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