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A magnetic needle is placed in a uniform...

A magnetic needle is placed in a uniform magnetic field and is aligned with the field. The needle is now rotated by an angle of `60^(@)` and the work done is W. The torque on the magnetic needle at this position is

A

`2sqrt3W`

B

`sqrt(3W)`

C

`(sqrt3)/(2)W`

D

`(sqrt3)/(4)W`

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Knowledge Check

  • A magnetic needle is kept in a non-uniform magnetic field. It experiences

    A
    a torque but not a force
    B
    neither a force nor a torque
    C
    a force and a torque
    D
    a force but not a torque

  • When a magnet is placed in a uniform magnetic field , it experiences

    A
    a force but no torque
    B
    a torque but no force
    C
    a force and also a torque
    D
    neither a force nor a torque

  • Magnetic needle is used to determine :

    A
    direction of electric field
    B
    strength of north pole
    C
    direction of magnetic field
    D
    strength of south pole

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