Problem

Questions 41-42 A sphere of radius

R

has positive charge

Q

uniformly distributed on its surface 42. Which of the following represents the magnitude, of the electric field E and the potential V as functions of r , the distance from the center of sphere, when

r>R

\begin{array}{lll} & \underline{E} & \underline{V} \\ \text { (A) } & \mathrm{kQ} / \mathrm{R}^{2} & \mathrm{kQ} / \mathrm{R} \\ \text { (B) } & \mathrm{kQ} / \mathrm{R} & \mathrm{kQ} / \mathrm{r} \\ \text { (C) } & \mathrm{kQ} / \mathrm{r}^{2} & \mathrm{kQ} / \mathrm{r} \\ \text { (D) } & \mathrm{kQ} / \mathrm{r}^{2} & \mathrm{kQ} / \mathrm{r}^{2}\end{array}

(A)

E = kQ/R^2

V = kQ/R

(B)

E = kQ/R

V = kQ/r

(C)

E = kQ/r^2

V = kQ/r

(D)

E = kQ/r^2

V = kQ/r^2

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