Four particles each having a charge q, are placed on the four vertices of a regular pentagon. The distance of each corner from the centre is a. Find the electric field at the centre of the pentagon.
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Explanation:
charges are present on corners B,C,D,E.
total electric force will be along the direction OA
magnitude of force = 24πϵ01a2qcos36∘−24πϵ01a2qcos72∘=4πϵ01a2q
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