Q A charge partical having drift velocity of 7.5 × 10-4 ms-1 in an electric field of 3×10 -10 Vm-1 , has a mobility in m2V -1s-1 of.
(a)2.25 ×10-15 (b) 2.5 ×10-6 (c) 2.5 ×106 (d) 2.25×1015

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