For a given electric current,the drift veloci | vedclass

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(A) The mobility of an electron is given by the formula: $\mu = \frac{e 	au}{m}$.Since the temperature is constant,the relaxation time $	au$ remains

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$v_d$ increases,$\mu$ remains the same

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(A) The mobility of an electron is given by the formula: $\mu = \frac{e 	au}{m}$.Since the temperature is constant,the relaxation time $	au$ remains constant,and therefore the mobility $\mu$ remains the same.The relationship between electric current $I$ and drift velocity $v_d$ is given by $I = n e A v_d$.From this equation,we can see that $v_d = \frac{I}{n e A}$.Since $n$,$e$,and $A$ are constants for a given wire,$v_d \propto I$.Therefore,when the current $I$ is increased,the drift velocity $v_d$ also increases.

For a given electric current,the drift velocity of conduction electrons in a copper wire is $v_d$ and their mobility is $\mu$. When the current is increased at constant temperature,

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