Q.
Derive an expression for the potential energy of an electric dipole placed in a uniform electric field?
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answer is 1.
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Detailed Solution
Consider an electric dipole placed in a uniform electric field with its dipole moment makes an angle with field. Two forces on two charges creates couple will be
If the dipole is rotated through a small angle d against the torque acting on it, then small work done is
The total work done in rotating the dipole from angle with the direction of field
This work done is stored as potential energy of dipole
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