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  4. 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 q1 is placed outside it as shown in figure. All the three charges are positive. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/800cc5f3852e9069265573e9be1d5e6b-.png /> The force on the charge at the centre is

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Q. 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 $q_{1}$ is placed outside it as shown in figure. All the three charges are positive.
image
The force on the charge at the centre is

Electric Charges and Fields

Solution:

Note that there is no field inside the metallic shell and hence no force is experienced by the charge at the centre.