First slide

Electrostatic force

Question

Two charges each of 1 coulomb are at a distance 1km apart, the force between them is

Easy

A

$9 \times 10^{3} Newton$
B

$9 \times 10^{- 3} Newton$
C

$1 .1 \times 10^{- 4} Newton$
D

$10^{4} Newton$

Solution

$F = \frac{{kQ}^{2}}{r^{2}} = 9 \times 10^{9} \times 1^{2} \times \frac{1}{{(1000)}^{2}} = 9 \times 10^{3} N$

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