Question

Two uniformly charged plates are pictured above, with four evenly spaced points shown along a horizontal lines between the plates. What is the correct rank of strength of the electric field at the points, greatest first?

• A. 1, 2, 3, 4
• B. 4, 3, 2, 1
• C. The electric field strength is the same at all points.
• D. 1 and 4 tie, 2 and 3 tie
• E. 2 and 3 tie, 1 and 4 tie

Answer 1

Answer: (C)

The electric field strength is the same at all points.

The electric field outsides the plates will be zero and the field in between the plates will be $E=\frac{\sigma }{2{ϵ}_0}+\frac{\sigma }{2{ϵ}_0}=\frac{\sigma }{{ϵ}_0}$

Thus, electric field in between the plates does not depend on the distance. Hence, the field at every point in between the plates will be same. Thus, option C will correct.