In an ink-jet printer the drops are charged by surrounding the jet of radius 20?m with a

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In an ink-jet printer the drops are charged by surrounding the jet of radius 20?m with a concentric cylinder of radius 600?m as in figure. Calculate the minimum voltage required to generate a charge 50fC on the drop if the length of the jet inside the cylinder is 100?m. Take ? = ?o.image

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