Question

The electric potential and electric field at any given position due to a point charge are 600 V and 200 N/C respectively. Then magnitude of point charge would be :

• A. $3\mu C$
• B. $30\mu C$
• C. $0.2\mu C$
• D. $0.5\mu C$

Answer 1

The correct option is C $0.2\mu C$

$\frac{Kq}{r}=600$

or $\frac{K^2{q}^2}{r^2}=360000$ ......(i)

$\frac{Kq}{r}=200$ .........(ii)

Divide

$Kq=1800$

$q=\frac{1800}{9\times 109}=200\times {10}^{-9}c$