Physics

Problem

## Questions 65-66 In a region of space, a spherically symmetric electric potential is given as a function of

r

, the distance from the origin, by the equation

V(r)=k r^{2}

, where

k

is a positive constant. 65. What is the magnitude of the electric field at a point a distance

\mathrm{r}_{0}

from the origin? (A) Zero (B)

\mathrm{kr}_{0}

(C)

2 \mathrm{kr}_{0}

(D)

\mathrm{kr}_{0}{ }^{2}

(E)

2 \mathrm{kr}_{0}{ }^{3} / 3

(A) Zero (B)

\mathrm{kr}_{0}

(C)

2 \mathrm{kr}_{0}

(D)

\mathrm{kr}_{0}{ }^{2}

(E)

2 \mathrm{kr}_{0}{ }^{3} / 3