CUET Preparation Today
CUET
Physics
Electric Charges and Fields
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$\text{Net Force on the oil drop is zero}$
$\Rightarrow qE = mg$
$\Rightarrow q = \frac{mg}{E} = \frac{9.9\times 10^{-15}\times 10}{3\times 10^4}= 3.3\times 10^{-18} C$
