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 `rho` how long will the charges take to travel a distance d?
A
`(rho d A)/(I)`
B
`(rho d A)/(I T)`
C
`(2 rho d A)/(I T)`
D
`(2 rho d A)/(I)`
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