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Rate of charges of torque tau with defle...

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

A

`theta =60^(@)`

B

`theta =90^(@)`

C

`theta =45^(@)`

D

`theta = 0^(@)`

Text Solution

Verified by Experts

The correct Answer is:
D
`tau =MB sin theta therefore ("d" tau)/("d" theta)=MB cos theta`
`(tau)/("d" theta)` will maximum when cos `theta =1 or theta =0^(@)`
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