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Current Electricity question

2018 · 15 Apr · Shift 2 · Q59
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Current Electricity question

2018 · 15 Apr · Shift 2 · Q59

JEE MainPhysicsCurrent ElectricityMCQ+4 / −1
A copper rod of cross-sectional area A carries a uniform current I through it. At temperature T, if the volume charge density of the rod is ρ\rhoρ, how long will the changes take to travel a distance d ?
  1. A
    2ρ d AI{{2\rho \,d\,A} \over {\rm I}}I2ρdA​
  2. B
    2ρ d AI T{{2\rho \,d\,A} \over {{\rm I}\,T}}IT2ρdA​
  3. C
    ρ d AI {{\rho \,d\,A} \over {{\rm I}\,}}IρdA​
  4. D
    ρ d AI T{{\rho \,d\,A} \over {{\rm I}\,T}}ITρdA​
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