A magnetic B field of strength 0.9 T is perpendicular to a loop with an area of 3 m2. If the area of the loop is reduced to zero in 0.5 s, then what is the magnitude of the induced emf voltage?

The magnitude of induced emf is 5.4 V

Explanation:

Given:

Magnetic field T

Area of loop

Time take to reduce loop to zero sec

To find induced emf we use faraday's law,

Induced emf is given by,

Here minus sign shows lenz law, for finding magnitude of emf  we ignore it.

Where

Put the value of flux and find induced emf,

    V

Therefore, the magnitude of induced emf is 5.4 V

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