An aluminium wire `7.5 m` long is connected in parallel with a copper wire `6 m` long.
Channel: Doubtnut
Date: 2020-07-26

An aluminium wire `7.5 m` long is connected in parallel with a copper wire `6 m` long. When a current of `5 A` is passed through the combination, it is found that the current in the aluminium wire is `3 A`. The diameter of the aluminium wire is `1 mm`. Determine the diameter of the copper wire. Resistivity of copper is `0.017 muOmega-m` and that of the aluminium is `0.028 muOmega-m`.