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4. A water droplet 0,1 mm in diameter carries a charge such that the electric eld at its surface is 6-104 Vm'l. [fit is placed

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4. A water droplet 0,1 mm in diameter carries a charge such that the electric eld at its surface is 6-104 Vm'l. [fit is placed between two parallel metal plates 10 mm apart, what p.d. must be applied to them to keep the drop from falling? Density of water 2 It]3 kgm'3. [3,14 kV]

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