Potential energy:

$\overline{){{\mathbf{U}}}_{\mathbf{d}\mathbf{i}\mathbf{p}\mathbf{o}\mathbf{l}\mathbf{e}}{\mathbf{=}}{\mathbf{-}}{\mathbf{P}}{\mathbf{E}}{\mathbf{c}}{\mathbf{o}}{\mathbf{s}}{\mathbf{\theta}}}$

Total energy:

$\overline{){\mathbf{E}}{\mathbf{=}}{\mathbf{K}}{\mathbf{E}}{\mathbf{+}}{\mathbf{U}}}$

The dipole is aligned with the electric field when θ = 0°.

The graph shows the potential energy of an electric dipole. Consider a dipole that oscillates between ±60°

What is dipole's kinetic energy when it is aligned with the electric field if the mechanical energy is -1μJ and potential energy of the system is 2μJ.

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