A charged particle having drift velocity of 7.5 10 -4 m s -1 in an electric field of 3 10 -10 Vm -1 , has a mobility in m 2 V -1 s -1 of :

1. A. 2.5 10 6
2. B. 2.5 10 -6
3. C. 2.25 10 -15
4. D. 2.25 10 15

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