An emf is induced in a conducting loop of wire 1.22 m long as its shape is changed from square to circular. Find the average magnitude of the induced emfif the change in shape occurs in 4.25 s and the local 0.125 T magnetic field is perpendicular to the plane of the loop.

The induced emf in the loop is

Explanation:

Given that,

Length of the wire, L = 1.22 m

It changes its shape is changed from square to circular. Then the side of square be its circumference, 4a = L

4a = 1.22

a = 0.305 m

Area of square,

Circumference of the loop,

Area of circle,

The induced emf is given by :

So, the induced emf in the loop is

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