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 density of crosses. Select true or false for the current in the loop. The cardinal directions are as defined in the compass rose. Fig 1: Loop moving West, induced current 'b'. Fig 2: Loop moving East, no induced current Fig 1: Magnet moving West, induced current 'b'. Fig 1: Magnet moving East, induced current 'a'. Fig 2: Loop moving North, induced current 'b'. Fig 2: Loop moving west, induced current 'b'. First determine if the flux through the loop is increasing, decreasing or unchanged. (1) If the flux is increasing, then the induced current produces a field that is opposite in direction to the field by the existing magnetic field. (2) If the flux is decreasing, then the

Explanation / Answer

Acccording to the given problem,

A) Flase,if a loop movies west the current is induced in "a" not "b"

B) Flase, 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’.

C) 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 ’b’.

D)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’.

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

F)Flase, 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’.

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