Question

Charges of $1\mu C$ and $10\mu C$ are placed and held $0.1m$ apart. What will be the force they exert on each other?

• A. $0.9N$
• B. $90N$
• C. $9N$
• D. $900N$

Answer 1

The correct option is C $9N$

$F=\frac{k{q}_1{q}_2}{r^2}$

$⟹F=\frac{9\times {10}^9\times {10}^{-6}\times 10\times {10}^{-6}}{(0.1{)}^2}$

$⟹F=9N$

Answer-(C)