Physics

Problem

![](https://storage.googleapis.com/diraq-contents/question-bank/question-images/176f264a76d0/2025_11_20_15035248b42bfae1659eg-18.jpg) 105. A solid uncharged conducting sphere has radius

3 a

contains a hollowed spherical region of radius

2 a

. 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

\mathrm{r}=4 a

from the center of the spheres as marked in the figure by

P

? (A) 0 (B)

\frac{k Q}{16 a^{2}}

(C)

\frac{3 k Q}{16 a^{2}}

(D)

\frac{k Q}{9 a^{2}}

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