The electric field intensity just suffic...

The electric field intensity just sufficient to balance the earth’s gravitational attraction on an electron will be: (given mass and charge of an electron respectively are `9.1xx10^(-31)kg` and `1.xx10^(-19)C)`

`-5.6xx10^(-11)N//C`

`-4.8xx10^(-15)N//C`

`-3.2xx10^(-15)N//C`

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