KCET2023PhysicsCurrent Electricity
For a given electric current the drift velocity of conduction electrons in a copper wire is v_d and their mobility is . When the current is increased at constant temperature
Options
- Av_d increases, remains the same
- Bv_d remains the same, increases
- Cv_d decreases, remains the same
- Dv_d remains the same, decreases
Correct answer
A. v_d increases, remains the same
Step-by-step solution
We know that, mobility of electron, = e m [ relaxation time ] Thus, for constant temperature, remains the same. Since, I=n e A v_d v_d I Hence, when current is increased, then drift velocity (v_d ) also increases.