The water rises!

A plastic ball of 1cm diameter and 10^-8 Coulomb of charge is suspended by an insulating string. The lowest point of the ball is 1cm above a big container of saltwater. Indeed, the water’s surface rises a bit. What is the water elevation height exactly below the ball?
Ignore the water’s surface tension and consider 1000kg/m³ the saltwater density


Spoiler


0,29cm

My english is quite rusty now, I am sorry for this, but I would really appreciate the help. Thanks.

http://ift.tt/1ktfObF

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