1.

An electric dipole is held in a uniform electricfield . (i)Show that the net force acting on it is zero.(ii)The dipole is aligned parallel to the field . Find the work done in rotating it throught theangle of 180^(@)

Answer»

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Solution :`vecF_(1)=+qvecEandvecF_(2)=-qvecE`
`vecF_("net")=vecF_(1)+vecF_(2)`
`thereforeF_("net")=0`
ALTERNATIVELY,

`thereforeF_("net")=0`
(II)Where p is the electric DIPOLE moment.
W=2pE


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