A regular polygon has 20 sides. Equalcharges, each Q, are placed at 19 vertices ofthe polygon and a charge q is placed at thecentre of polygon. If the distance of eachvertex from the centre is ‘a’ , net forceexperienced by q is
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Answer: KQq/a²
Explanation:
I m not making the figure because it's very hectic so read this
since there are 20 sides and 19 Charges on each vertex but we can see that pair of 9s are equal and opposite so as they are vectors they will cut each other and only 1 charge will left so only it will exert the force
which will be
F = KQq/a²
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