A small ball carring 1mu C of change is...

A small ball carring `1mu C` of change is suspended over an infinite horizontal conducting plane by means of an insulating spring of force constant `100Nm^(-1)` Calculate the increase In length of the spring if the plane has a surface density of change equal to `-8.85xx10^(-6) Cm^(-2)`

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The correct Answer is:

0.31 m

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