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| $A$. गतिशीलता (Mobility) | $P$. $\frac{m}{ne^2 \rho}$ |
| $B$. विद्युत चालकता | $Q$. $neAv_{d}$ |
| $C$. विश्रांति काल (Relaxation period) | $R$. $\frac{v_{d}}{E}$ |
| $D$. विद्युत धारा | $S$. $\frac{J}{E}$ |
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