1.

The electric field strength in N C^(-1) that is required to just prevent a water drop carrying a change 1.6 xx 10^(-19)C from falling under gravity is (g = 9.8 m s^(-2), the mass of water drop = 0.0016 g )

Answer»

`9.8 xx10^(-16)`
`9.8 xx10^(16)`
`9.8 xx10^(-13)`
`9.8 xx10^(13)`

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