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Rate of change of torque tau with deflec...

Rate of change of torque `tau` with deflection `theta` is maximum for a magnet suspended freely in a uniform magnetic field of induction B when

A

`theta=0^(@)`

B

`theta=45^(@)`

C

`theta=60^(@)`

D

`theta=90^(@)`

Text Solution

Verified by Experts

The correct Answer is:
A
`tau =MB sin theta`
`(d tau)/(d theta)=MH cos theta`
`cos theta =1` i.e `theta=0^(@)`
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