Two charges +q and -q are placed at a distanc | vedclass

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Question

(B, C) In a uniform electric field $\vec{E}$,the force on charge $+q$ is $\vec{F}_+ = q\vec{E}$ and the force on charge $-q$ is $\vec{F}_- = -q\vec{E}

Vedclass · Accepted Answer

The net force is independent of $a$

Vedclass · Answer

(B, C) In a uniform electric field $\vec{E}$,the force on charge $+q$ is $\vec{F}_+ = q\vec{E}$ and the force on charge $-q$ is $\vec{F}_- = -q\vec{E}$.The net force on the dipole is $\vec{F}_{net} = \vec{F}_+ + \vec{F}_- = q\vec{E} - q\vec{E} = 0$. Thus,the net force on the dipole always vanishes.The torque on the dipole is given by $\vec{	au} = \vec{p} 	imes \vec{E}$. Since the torque is defined as the cross product of the dipole moment and the electric field,it is a physical quantity and is independent of the choice of the coordinate system.Therefore,statements $(b)$ and $(c)$ are correct.

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