A positive point charge $q$ is placed at a distance $2 R$ from the surface of a metallic shell of radius $R$. The electric field at centre of shell due to induced charge has magnitude
A positive point charge $q$ is placed at a distance $2 R$ from the surface of a metallic shell of radius $R$. The electric field at centre of shell due to induced charge has magnitude
- A
Zero
- B
$\frac{1}{4 \pi \varepsilon_0} \frac{q}{9 R^2}$
- C
$\frac{1}{4 \pi \varepsilon_0} \frac{q}{4 R^2}$
- D
$\frac{1}{4 \pi \varepsilon_0} \frac{q}{R^2}$
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