electric-charges-and-fields Question 17
Question: Q. 7. 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
R [O.D. I, II, III 2012]
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Solution:
Ans. (i)
$$ \begin{aligned} & \vec{F}{\text {net }}=\vec{F}{1}+\vec{F}{2} \ \therefore \quad & \vec{F}{\text {net }}=\overrightarrow{0} \end{aligned} $$
(ii)
[CBSE Marking Scheme, 2012]
Detailed Answer :
(i) In an electric dipole with two equal and opposite point charges,
If dipole is kept in an uniform external electric field
(a) force on charge
Hence, net force on dipole will be given as:
(ii) Work done,
or
Work done on dipole,
