Physics, asked by hemantchaudhary278, 10 months ago

A rectangular coil of single turn, having area A,
rotates in a uniform magnetic field B with angular
speed w about an axis perpendicular to the field.
If initially the plane of the coil is perpendicular to
the field, then the average induced emf when it has
rotated through 90° is

Answers

Answered by Anonymous
41

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Initially flux, ϕ=BAcos0=BA

After rotating through an angle 90 \degree

Flux through the coil is zero.

So,

Δϕ=BA

Angular speed =w so, time period =  \frac{w}{2\pi}  =T

 \frac{t}{4} is time taken to rotate 90  \degree

So,

 \frac{Δϕ}{Δt}  =  \frac{BA}{T/4}  =  \frac{2BAω}{\pi}

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