how to calculate the magnitude of an electric field which can just balance a eutron of mass 3.2*10^-27kg?

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Solution

If you wish to balance it against the gravitational force then equate the gravitational force acting on it with the electrostatic force.
ie, qE = mg
E = mg/q
= (3.2x10^-27x10)/(1.6x10^-19)
= 51.2x10^-46N/C

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