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    imfaizz's Avatar
    imfaizz Posts: 1, Reputation: 1
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    #1

    Mar 25, 2014, 08:38 AM
    Dipole in a uniform external field
    How do you prove that torque is equal to p.e sin theta
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 25, 2014, 11:14 AM
    The relevant formula is:



    where = torque acting on the dipole, m is the dipole moment vector and B is the external magnetic field. The value for m for a dipole is pl, where p = the magnetic pole strength and l is the vector between the two poles (fropm south to north). Now if you know how to apply the cross product between vectors m and B you're there.
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