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  4. The magnitude of electric field intensity E, such that an electron placed in it would experience an electrical force equal to its weight, is given by

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Q. The magnitude of electric field intensity $E$, such that an electron placed in it would experience an electrical force equal to its weight, is given by

BITSATBITSAT 2011

Solution:

Force on electron
$| F |= qE = eE = mg$
$E =\frac{ mg }{ e }$