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A magnetic needle suspended parallel to ...

A magnetic needle suspended parallel to a magnetic field requires `sqrt3J` of work to turn it through `60^@`. The torque needed to maintain the needle in this postion will be:

A

`sqrt(3)J`

B

`(3)/(2)J`

C

`2sqrt(3)J`

D

`3J`

Text Solution

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The correct Answer is:
D
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