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A short bar magnet o magnetic field . It...

A short bar magnet o magnetic field . It experiences a torque of `0.05` J.
Calculate the magnitude of the magnetic field.

Text Solution

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The position of minimum energy corresponds to position of stable equilibrium
The energy `(upsilon) = - mB cos theta `
when `theta = 0^(@) , upsilon = - mu B ` = minimum energy Hence when the bar magnet is placed parallel to the magnetic field , it is the state of stable equilibrium.
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