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Four point charges each of magnitude Q a...

Four point charges each of magnitude Q and mass m are moving on circular path with uniform speed under the influence of electrostatic force as shown in the figure. If AB= BC= CD= DA =√2R, then speed of either of them is (`k=1/(4π epsilon_0` )

A

`sqrt (((2√2+1) kQ^2)/(4mR) ) `

B

`sqrt (((2√2+1) kQ^2)/(2mR) ) `

C

`sqrt (((2√2-1) kQ^2)/(4mR) ) `

D

`sqrt (((2√2-1) kQ^2)/(2mR) ) `

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