A dipole with the magnitude of dipole moment 0.5 C-m is placed in an external uniform electric field of magnitude $10 \frac{N}{C}$ . $\to p$ makes an angle of $60^{\circ}$ with $\to E$ . What is the potential energy of the dipole in the current configuration provided that the potential energy is taken zero when dipole is perpendicular to the applied field?

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Solution

The correct option is D
Potential energy is of a dipole in an external field is given by $- \to - p . \to E$
$U (60^{\circ}) = - 0.5 \times 10 \times cos (60^{\circ}) = - 2.5 J$

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An electric dipole when placed in a uniform electric field E→ will have minimum potential energy, if the positive direction of the dipole make an angle of _____ rad with E→.

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The correct option is D Potential energy is of a dipole in an external field is given by −→−p.→E U(60∘)=−0.5×10×cos(60∘)=−2.5J

The correct option is D
Potential energy is of a dipole in an external field is given by $- \to - p . \to E$
$U (60^{\circ}) = - 0.5 \times 10 \times cos (60^{\circ}) = - 2.5 J$