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A closely would solenoid of 2000 turns a...

A closely would solenoid of 2000 turns and area of cross-section `1.6xx10^(-4)m^(2)`. Carrying a current of 4.0A. Is suspended through its centre allowing it to turn in a horizontal plane.
(a) What is the magnetic moment associated with the solenoid?
(b) What is the force and torque on the solenoid if a uniform horizontal mangetic field of `7.5xx10^(-2)T` is set up at an angle of `30^(@)` the axis of the solenoid?

A

`1.28xx10^(-2)Nm`

B

`7.5xx10^(-2)Nm`

C

`4.8xx10^(-2)Nm`

D

None

Text Solution

Verified by Experts

The correct Answer is:
C
`4.8xx10^(-2)` Nm
Explanation: `tau=mBsintheta`
`=1.28xx7.5xx10^(-2)xxsin30^@`
`=1.28xx7.5xx10^2xx1//2`
`=4.8xx10^(-2)`Nm
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