1) The figures below show two different situations where a current may be induce

Question

1) 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 ALL correct answers (i.e. B, AC, BCD) for the current in the loop. (The compass directions are defined in the usual way.)

A) fig2: Loop moving South, no induced current.
B) fig1: Loop moving West, induced current `a'.
C) fig2: Loop moving East, induced current `b'.
D) fig2: Loop moving North, induced current `b'.
E) fig1: Magnet moving West, induced current `a'.
F) fig1: Magnet moving East, induced current `a'.

Explanation / Answer

as the magnetic field is always at right angle to the movement of the loop, as long as movement is happening there will be an emf induced.

now according to lenz's law, the induced current will try to create a magnetic field which is oppoiste to the original magnetic field

so if the current direction is a, then according to right hand law, the magnetic field created by this current will be out of page.

hence it will be opposite to the direction of magnetic field present

so option B,E and F are correct.

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