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A magnetic needle lying parallel to a ma...

A magnetic needle lying parallel to a magnetic field requires W units of work to turn through `60^(@)` . The external torque required to maintain the magnetic needle in this position is

A

`sqrt(3) W`

B

`( sqrt(3) )/(2) W `

C

` w//2`

D

`2W`

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AAKASH SERIES-APPENDICES ( REVISION EXERCISE )-REVISION EXERCISE (MAGNETISM AND MATTER )
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