Question

What is the magnitude of the electric field at point $P$ in the diagram?

• A. $2V/m$
• B. $5V/m$
• C. $10V/m$
• D. $20V/m$

Answer 1

The correct option is D $20V/m$

From figure, $d=\frac{0.1}{2}=0.05$ m

Potential difference between 2nd and 3rd line $\Delta V=4-3=1$ volts

Magnitude of electric field $|E|=\frac{|\Delta V|}{d}=\frac{1}{0.05}=20$ volts/meter