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  4. A thin metallic spherical shell contains a charge Q on its surface. A point charge q1 is placed at the center of the shell, and another charge q2 is placed outside the shell. All three charges are positive. Then the force on charge q1 is:- <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-qpesjhd5b0iz0l0x.jpg />

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Q. A thin metallic spherical shell contains a charge $Q$ on its surface. A point charge $q_{1}$ is placed at the center of the shell, and another charge $q_{2}$ is placed outside the shell. All three charges are positive. Then the force on charge $q_{1}$ is:-
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NTA AbhyasNTA Abhyas 2022

Solution:

We know that the electric field inside the metallic cavity due to the charge present on the surface is zero and this phenomenon is known as electrostatic shielding.
So, the force experienced by charge $q_{1}$ is also zero.