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Question

Find force on semicircular ring due to point charge q.
1178143_16503763a7624a29be9394779cb00a96.png

Solution
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Consider an element at an angle θ charge dq=λRdθ
Force on charge dq,df=KqdqR2
=KqλRdθR2
Due to symmetry of the system we see Fx gets cancelled
dfy=KgλRπ0sinθdθ

=KqλR[cosθ]π0

F=2KqλR

1368008_1178143_ans_c7275f92c61543cd905cd4e4f2539def.png

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