A) S2, S3 and S4
B) S3 and S4
C) S2 and S3
D) All four
Correct Answer: D
Solution :
(i) An electric dipole is a pair of equal and opposite charges q and - q separated by same distance 2\[l\]. (ii) The electric field due to a dipole at a point P is \[E=\frac{p}{4\pi {{\varepsilon }_{0}}}\frac{\sqrt{3{{\cos }^{2}}\theta +1}}{{{r}^{3}}}\] \[(r>>a)\] (iii) The electric potential due to dipole in its general position is given by \[V=\frac{k\,.\,\,p\cos \theta }{{{r}^{2}}}\] \[V\propto \frac{1}{{{r}^{2}}}\] So, the electric dipole potential falls off as \[\frac{1}{{{r}^{2}}}\]and not as \[\frac{1}{r}\]. (iv) In a uniform electric field, the electric dipole experiences no net force but a torque \[\tau =\vec{p}\times \vec{E}\]You need to login to perform this action.
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