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Derive the equation for the couple actin...

Derive the equation for the couple acting on a bar magnet in a uniform magnetic field and hence deduce the definition of "magnetic moment".

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Torque acting on a current loop in a uniform magnetic field is equal to

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Knowledge Check

  • In a uniform magnetic field, the field lines are :

    A
    curved
    B
    parallel and equidistant straight lines
    C
    parallel, but non-equispaced straight lines
    D
    nothing can be said.

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