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

Please explain each answer.

Explanation / Answer

a) true

loop is moving towords magnet so increment in flux to oppose this increment induce current direction in the loop is in b

b) true

magnet move away from loop this will give decresing flux through the loop

so current through loop would oppose this decrement so current through loop is in direction a

c) true

magnet is moving parallel to the loop's plane so no change in flux through the loop

no induce current will flow

d) true

loop is moving away from magnet so flux through loop is decreasing

to oppose this decement current through loop is in a

e) false

when magnet is moving in west

magnet move towords the loop this will give incresing flux through the loop

so current through loop would oppose this increment so current through loop is in direction b

f) false

loop is moving north no change in flux so no induce current in the loop

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