Question

Five identical charges, q_1 each, are placed at the vertices of a regular pentagon having side length l_1. The net electrostatic force on any of the charges due to other four is F_1. Find the electrostatic force F_2 on any one of the five identical charges, q_2 each, placed at the vertices of a regular pentagon having side length l_2.

Answer 1

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Answer 2

Explanation:

I hope you got it. here all the charges ( q¹) are placed at all sides of pentagon and resultant is taken as 2l¹cos(theta)