Five charges, q each, are placed at the ...

Five charges, q each, are placed at the corners of a regular pentagon of side a as shown in the figure.
What will be the electric field at O, the centre of the pentagon? What will be the electric field at O, fi the charge from one of the corners (Say A) is removed? What will be the electric field at O, if the charge q at A is repalced by - q?

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