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(A) The metallic spherical shell acts as an electrostatic shield. According to the property of conductors in electrostatic equilibrium,the electric fi

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(A) The metallic spherical shell acts as an electrostatic shield. According to the property of conductors in electrostatic equilibrium,the electric field inside the material of a conductor is zero. Furthermore,for a closed conducting shell,the electric field inside the cavity is independent of any external charges placed outside the shell.The charge $q$ placed at the centre experiences no force from the charge $q'$ outside,because the metallic shell screens the interior from external electric fields.The charge $Q$ distributed on the spherical shell is spherically symmetric (or induces a symmetric distribution if $q'$ is present),and by Gauss's Law,the net electric field at the centre due to the shell itself is zero.Therefore,the net electric force on the charge $q$ at the centre is zero.

$A$ thin metallic spherical shell contains a charge $Q$ on it. $A$ point charge $+q$ is placed at the centre of the shell and another charge $q'$ is placed outside it as shown in the figure. All the three charges are positive. The force on the charge at the centre is:

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