First slide

Electric dipole

Question

Two electric dipoles each of dipolemoment P = 6.2×10^–30C-m are placed with their axis along the same line and their centres at a distanced = 10^–8cm. The force of attraction between dipoles is

Easy

A

2.1 × 10^–16N
B

2.1 × 10^–12N
C

2.1 × 10^–10N
D

2.1 × 10^–8N

Solution

$F = - \frac{1}{4 {πε}_{0}} \frac{6 p_{1} p_{2}}{r^{4}} = \frac{9 x 10^{9} x 6 x 6.2 x 6.2 x 10^{- 60}}{{(10^{- 10})}^{4}}$
= 2.1 × 10^-8 N attractive

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