A coil lies on a horizontal plane and the south pole of the magnet is pulled out

Question

A coil lies on a horizontal plane and the south pole of the magnet is pulled out of the coil with a quick movement in the direction shown in the diagram below.

Find the direction of the induced current in the coil, when looking down on the coil from above, by answering the following questions.

(a) What is the direction of the magnetic field due to the magnet in the center of the coil?

+xx    +yy+zz

(b) As the magnet is moved in the direction indicated, how will the magnetic flux in the coil change?

increasedecrease    remain the same

(c) What is the direction of the induced magnetic flux in the coil?

+xx    +yy+zz

(d) What is the direction of the induced current in the coil when viewed from above the coil?

clockwisecounterclockwise    no current

Explanation / Answer

lenz law = flux = -rate of change in flux

as the magnet moves up ward, the magnetic flux decreases in upward direction.

so the induced current flows counter clock wise to increase the flux

(a)

upward +y

(b)

decreses

(c)

+y

(d)
counterclockwise

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