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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.

A

`(q)/(4 pi epsilon_(0)a^(2))`

B

`(2q)/(4 pi epsilon_(0)a^(2))`

C

`(3q)/(4 pi epsilon_(0)a^(2))`

D

`(4q)/(4 pi epsilon_(0)a^(2))`

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