Question

A charged particle having drift velocity of $7.5\times {10}^{-4}m$ $s^{-1}$ in electric field of $3\times {10}^{-10}$V $m^{-1}$, mobility is?

• A. $6.5\times {10}^6{m}^2{V}^{-1}{s}^{-1}$
• B. $2.5\times {10}^6{m}^2{V}^{-1}{s}^{-1}$
• C. $2.5\times {10}^4{m}^2{V}^{-1}{s}^{-1}$
• D. $6.5\times {10}^4{m}^2{V}^{-1}{s}^{-1}$

Answer 1

The correct option is B $2.5\times {10}^6{m}^2{V}^{-1}{s}^{-1}$

Given:

$V_d=7.5\times {10}^{-4}$

$E=3\times {10}^{-10}$

Mobility of charged particle

$\mu =\frac{|v_d|}{E}=\frac{7.5\times {10}^{-4}}{3\times {10}^{-10}}=2.5\times {10}^6{m}^2{V}^{-1}{s}^{-1}$.