Current Electricity - Result Question 3
4. A charged particle having drift velocity of $7.5 \times 10^{-4} m s^{-1}$ in an electric field of $3 \times 10^{-10}$ $Vm^{-1}$, has a mobility in $m^{2} V^{-1} s^{-1}$ of: [2020]
(a) $2.5 \times 10^{6}$
(b) $2.5 \times 10^{-6}$
(c) $2.25 \times 10^{-15}$
(d) $2.25 \times 10^{15}$
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Answer:
Correct Answer: 4. (a)
Solution:
- (a) Given,
Drift velocity of charged particle,
$V_d=7.5 \times 10^{-4} m / s$
Electric field, $E=3 \times 10^{-10} Vm^{-1}$
Mobility, $\mu=\frac{V_d}{E}=\frac{7.5 \times 10^{-4}}{3 \times 10^{-10}}=2.5 \times 10^{6} m^{2} V^{-1} s^{-1}$
