CBSE Class 12-science Answered

To understand the concept, following principles of electromagnetic induction should be known.

(i) Lenz's law

Lenz's law states that the direction of an induced current is always such as to oppose the change in the

magnetic field that produces it.

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(ii) direction of magnetic field due to the current in the loop.

If current flows clockwise direction in the loop and the loop is the plane of page , then direction of magnetic field

within the loop is into the page

If current flows counterclockwise direction in the loop and the loop is the plane of page , then direction of magnetic field

within the loop is out of  the page

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When the loop is pulled out of magnetic field , flux of magntic field passing through the loop is decreasing.

According to Faraday's law of induction, Change in flux of magntic field induces induced EMF in the loop and

hence induced current flows in the loop. Direction of induced current is determined by Lenz's law .

Since flux of magnetic field decreasing , Lenz's law states that induced current opposes the reduction in flux

by creating magnetic field due to induced EMFin the same direction of exisiting magnetic field.

Direction of existing magnetic field is into the page .

Hence direction of magnetic field due to induced current is also into the page .

If direction of magnetic field due to induced current is  into the page , then direction of induced current in the loop is

clockwise direction.