A charged oil dop is held stationary between the two horizontal plates of a capacitor when a field of 576 kV `m^(-1)` is applied between them. When the field is removed the drop falls freely with a steady velocity of `0.120 xx 10^(-3) ms^(-1)`. Find values for (i) the radius of the drop and (ii) its charge assuming that `6 eta = 0.109 xx 10^(-4) kg m^(-1) s^(-1)` and the difference between the densities of oil and air may be taken as 800 kg `m^(-3)`.

A charged oil dop is held stationary between the two horizontal plates

1.	A charged oil dop is held stationary between the two horizontal plates of a capacitor when a field of 576 kV `m^(-1)` is applied between them. When the field is removed the drop falls freely with a steady velocity of `0.120 xx 10^(-3) ms^(-1)`. Find values for (i) the radius of the drop and (ii) its charge assuming that `6 eta = 0.109 xx 10^(-4) kg m^(-1) s^(-1)` and the difference between the densities of oil and air may be taken as 800 kg `m^(-3)`.
Answer» Correct Answer - `(i) 1.12 xx 10^(4) m " "(ii) 797 xx 10^(-19)` coulomb

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