Question

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

• A. $m\,g\,e$
• B. $\frac{mg}{e}$
• C. $\frac{e}{mg}$
• D. $\frac{e^2}{m^2} g$

Answer 1

Answer: (B)

$\frac{mg}{e}$

Answer 2

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