First slide

Electric dipole

Question

A charge situated at a certain distance from an electric dipole in the end-on position, experiences a force F If the distance of the charge is doubled, the force acting on the Charge will be

Easy

A

2F
B

F/2
C

F/4
D

F/8

Solution

Force on charge, $F = q (E_{a}) = q \times \frac{k \cdot 2 p}{r^{3}} \Rightarrow F \propto \frac{1}{r^{3}}$
$When r \to doubled; F \to \frac{1}{8} times$

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