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A thin metallic spherical shell contains...

A thin metallic spherical shell contains a charge Q on it. A point charge q is placed at the center of the shell and another charge `q_1` is placed outside it as shown in the figure. All the three charges are positive. Find the force on the charge

a. at centre due to all charges.
b. at center due to shell.

Text Solution

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a. No force will be experience by the charge at the
centre as it is electrostatically shielded.

b. There will not be any field at centre due to the charges Q and q. The charge induced at the surface of spherical shell due to q will produce the field towards right. This field will be responsible for producing force at centre towards right.
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CENGAGE PHYSICS ENGLISH-ELECTRIC FLUX AND GAUSS LAW-Exercise 2.1
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