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
Medium
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(b)
$\vec{E}_{ int }+\vec{E}_{ ext }=0$
$\vec{E}_{ int }=\vec{E}_{ ext }$
$\vec{E}_{ int }=\frac{k q}{9 R^2}$
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