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Magnetic Field

In the given ...

Question

In the given arrangement, the loop is moved with constant velocity v in a uniform magnetic field B in a restricted region of width a. The time for which the emf is induced in the circuit is?

\frac{2 b}{v}

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\frac{2 a}{v}

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\frac{(a + b)}{v}

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\frac{2 (a - b)}{v}

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Solution

The correct option is B $\frac{2 a}{v}$
REF.Image.
Emf is induced in the circuit only when there
is a change in magnetic field.
Thus time for which EMF is induced
$\frac{a}{v} + \frac{a}{v} = \frac{2 a}{v}$

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