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Eleven equal point charges, all of them ...

Eleven equal point charges, all of them having a charge +Q, are placed at all the hour positions of a circular clock of radius r, except at the 10 hour position. What is the electric field strength at the centre of the clock ?

A

`Q/(4piepsilon_(0)r^(2))` the centre towards the mark 10

B

`Q/(4piepsilon_(0)r^(2))` towards the centre

C

`Q/(4piepsilon_(0)r^(2))` from the centre towards the mark 6

D

zero

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