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Q. Consider the situation of the previous problem. The force on the central charge due to the shell is

Electric Charges and Fields

Solution:

Force on charge $=$ for between shall & charge $+$ force between charge $8 a$
Electric field inside a spherical shell is $0$
So, $F = qE =0$
force due to shell on charge at center $=0$
net force $=$ force between two charge $= Kq 2 / r ^{2}$
Hence net force due to
charge $=0$