Question

Figure shows equipotential surfaces.

What is the direction of electric field $E$ at $P$ and $R$ ?

• A. At $P, E$ is to the left. At $R, E$ is upward
• B. At $P, E$ is to the right. At $R, E$ is downward
• C. At $P, E$ is to downward. At $R, E$ is to the left
• D. At $P, E$ is to upward. At $R, E$ is to the right

Answer 1

Answer: (A)

Electric field lines are perpendicular to the equipotential surfaces and point in the direction of decreasing potential. At $P$, electric field $E$ is to the left. At $R, E$ is upward.