As oil drop of 12 excess electron is held stationary under a constant electric field of $2.55 \times 10^4 \;N/C$ in Millikan's oil drop experiment . The density of the oil is $1.26\;g/cm^3$ Estimate the radius of the drop . $(g = 9.8 \;m/s^2; e = 1.60 \times 10^{-91}\;C)$

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