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An electric dipole is held in a uniform ...

An electric dipole is held in a uniform electric field.
(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 through the angle of `180^(@)`.

Text Solution

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`vecF_(1)= +qvecE and vecF_(2)= -q vecE`
(i) `vecF_("net")=vecF_(1)+vecF_(2)`
`:.vecF_("net")=vec0`
Alternatively,

`:.vecF_("net")=vec0`
(ii) `W=Ep(cos theta_(1)-cos theta_(2))`
Since `cos0^(@)=1`
and `cos 180^(@)= -1`
`W=2Ep`
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