A small oil drop of mass `10^(-6)` kg is hanging in at rest between two plates separated by 1 mm having in at rest between two plates separated by 1 mm having a potential difference of 500 V. The charge on the drop is `(g= 10 ms^(-2))`
A. `2xx10^(-9) C`
B. `2xx10^(-11) C`
C. `2xx10^(-6) C`
D. `2xx10^(-9) C`