Two point charges $-4\,\mu c$ and $4\,\mu c$, constituting an electric dipole, are placed at $(-9,0,0)$cm and $(9,0,0)$cm in a uniform electric field of strength $10^4\,\mathrm{NC^{-1}}$. The work done on the dipole in rotating it from the equilibrium through $180^\circ$ is :

Question

Dr. Abubacker · Accepted Answer

[Solution by Dr. Abubacker] $p=qd=4	imes10^{-6}	imes0.18=7.2	imes10^{-7}$ C m. Work to rotate by $180^\circ$ from equilibrium: $W=2pE=2	imes7.2	imes10^{-7}	imes10^4=14.4	imes10^{-3}$ J $=14.4$ mJ. Answer (2).

Q. Two point charges $-4\,\mu c$ and $4\,\mu c$, constituting an electric dipole, are placed at $(-9,0,0)$cm and $(9,0,0)$cm in a uniform electric field of strength $10^4\,\mathrm{NC^{-1}}$. The work done on the dipole in rotating it from the equilibrium through $180^\circ$ is :

Explanation

Reviewed by Dr. Abubacker

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