Five charges, q each are placed at the corners of a regular pentagon of side 'a'.
(a) (i) What will be the electric field at O, the centre of the pentagon?
(ii) What will be the electric field at O if the charge from one of the corners (say A) is removed?
(iii) What will be the electric field at O if the charge q at A is replaced by -q?
(b) How would your answer to (a) be affected if the pentagon is replaced by an n-sided regular polygon with charge q at each of its corners?
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