Question

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

• A. $9\times {10}^{3}Newton$
• B. $9\times {10}^{-3}Newton$
• C. $1.1\times {10}^{-4}Newton$
• D. ${10}^{4}Newton$

Answer 1

The correct option is A $9\times {10}^{3}Newton$

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