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The electric field strength due to a ri...

The electric field strength due to a ring of radius `R` at a distance `x` from its centre on the axis of ring carrying charge `Q` is given by
`E = (1)/(4 pi epsilon_(0)) (Qx)/((R^(2) + x^(2))^(3//2))`
At what distance from the centre will the electric field be maximum ?

A

`x = R`

B

`x = (R )/(2)`

C

`x = +- (R )/(sqrt(2))`

D

`x = sqrt(2) R`

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