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A small non-conducting ball of mass m=1m...

A small non-conducting ball of mass `m`=1mg and charge `q=2times10^(-8)`C hangs from an insulating thread that makes an angle `theta=30^(@)` with vertical uniformly charged non-conducting sheet.Considering the gravitational force on the ball and assuming that the sheet extends for vertically and into out of the page.Calculate surface charge density of sheet.

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`37nc//m^(2)`
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