The drift velocity of the electrons in a copper wire of length 2 m under the application of a potential difference of `220 V` is `0.5 ms^(-1)`. Their mobility (in `m^2 V^(-1) s^(-1)`)
Options:
(a) `2.5 xx 10^(-3)`
(b) `2.5 xx 10^(-2)`
(c) `5 xx 10^2`
(d) `5 xx 10^(-3)`