Question

Two charges $Q_{1}=18 \,\mu C$ and $Q_{2}=-2\, \mu C$ are separated by a distance $R$, and $Q_{1}$ is on the left of $Q_{2}$. The distance of the point where the net electric field is zero is

• A. between $Q_{1}$ and $Q_{2}$
• B. left of $Q_{1}$ at $R / 2$
• C. right of $Q_{2}$ at $R$
• D. right of $Q_{2}$ at $R / 2$

Answer 1

Answer: (D)

$\frac{k Q_{2}}{x^{2}}=\frac{k Q_{1}}{(x+R)^{2}}$ or $x=\frac{R}{2}$