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The final torque on a coil having magnet...

The final torque on a coil having magnetic moment 25 A m2 in a 5 T uniform external magnetic field, if the coil rotates through an angle of `60^(@)` under the influence of the magnetic field is

A

216.5Nm

B

108.25Nm

C

102.5Nm

D

258.1Nm

Text Solution

Verified by Experts

The correct Answer is:
B
`|vec(tau)|=|vecmxxvecB|=mBsin theta`
Here, `m=25Am^(2),theta=60^(@),B=5T`
`therefore" "tau=25xx5xxsin 60^(@) or tau=125xx(sqrt3)/(2)=108.25" N m"`
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