A solid uncharged conducting sphere has radius 3a contains a hollowed spherical region of radius 2a

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2. Electric Potential and Capacitance

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A solid uncharged conducting sphere has radius $3a$ contains a hollowed spherical region of radius $2a$. A point charge $+Q$ is placed at a position a distance a from the common center of the spheres. What is the magnitude of the electric field at the position $r = 4a$ from the center of the spheres as marked in the figure by $P?$ $\left( {k = \frac{1}{{4\pi { \in _0}}}} \right)$

A

$0$

B

$\frac{kQ}{16a^2}$

C

$\frac{3kQ}{16a^2}$

D

$\frac{kQ}{9a^2}$

Solution

Standard 12

Physics

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