A coil has 2000 turns and area of 70cm^...

A coil has `2000` turns and area of `70cm^(2)`. The magnetic field perpendicular to the plane of the coil is `0.3 Wb//m^(2)` and takes `0.1` sec to rotate through `180^(0)`. The value of the induced e.m.f. will be

`8.4V`

`84V`

`42V`

`4.2V`

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