1.

What is potential energy of a dipole ?

Answer»

Solution :The work done in rotating a DIPOLE in the magenatic field is STORED into as potential energy
1 U= MH `[cos theta_1- cos theta_2]`
when MAGNET rotates from `thita_1` to `thita _2` against a torque.
Let `theta _1=90^@` and `theta_2=theta`
Then U = - MH cos Q = - `vec M vec H`
For `theta = 0^@`, U= + MH (minimum)
For `theta = 90^@`,U = 0
`theta = 180^@`, U = - MH (maximum)


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