Question

A hollow conducting sphere has a net charge of $+Q$. There are four labeled points all on the inside of the sphere, as shown above. Points A through D are located progressively closer to the center of the sphere.
Which point has the largest magnitude of electric field?

• A. Point A
• B. Point B
• C. Point C
• D. Point D
• E. All points have the same magnitude of electric field

Answer 1

The correct option is E All points have the same magnitude of electric field

From Gauss' Law

$E=\frac{Q_{enclosed}}{4\pi {ϵ}_0{r}^2}$

Since all the charge $+Q$ resides on the surface of the sphere, from the Guass' Law, the electric field at all points inside the sphere is zero.

Hence the correct answer is option E.