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  4. The angle between, p electric dipole moment p and the electric field E when the dipole is in stable equilibrium

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Q. The angle between, $\overrightarrow{p}$ electric dipole moment p and the electric field $\overrightarrow{E}$ when the dipole is in stable equilibrium

Electrostatic Potential and Capacitance

Solution:

The dipole is in stable equilibrium, when the torque on it is zero. Since $\overrightarrow{\tau} = \overrightarrow{p} \times \overrightarrow{E}$, therefore $\tau$ = 0 when the angle between $\overrightarrow{p}$ and $\overrightarrow{E}$ = 0.