Question 955: Electrostats & Capacitance

Question

An electric dipole of moment $$\overrightarrow p $$ is lying along a uniform electric field $$\overrightarrow E $$. The work done in rotating the dipole by 90o is

Accepted Answer

Work done in deflecting a dipole through an angle $$	heta $$ is given by
$$W = \int\limits_0^	heta  {pE\sin 	heta d	heta }  = pE\left( {1 - \cos 	heta } ight)$$
Since $$	heta $$ = 90ÃÂ°
$$ 	herefore $$ W = pE(1 Ã¢ÂÂ cos90ÃÂ°)  $$ \Rightarrow $$  W = pE

Answer

pE

Answer

$$\sqrt 2 pE$$

Answer

pE/2

Answer

2pE

Electrostats & Capacitance

An electric dipole of moment $\overrightarrow p is lying along a uniform electric field \overrightarrow E $. The work done in rotating the dipole by 90o is

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