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A non-conducting uniformly charge spheri...

A non-conducting uniformly charge spherical shell is kept on a rough non-conducting horizontal surface.Mass of shell is 2kg and charge on it is 1C and friction coefficient between surface and shell is 0.18 and take g=10m/s^(2) . What will be minimum value of external horizontal electric field (uniform) so that shell starts sliding on the surface. Give your answer is S.I.units

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