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A copper wire of diameter 0.16 cm is con...

A copper wire of diameter 0.16 cm is connected in series to an aluminium wire of diameter 0.25 cm. A current of 10 A is passed through them. Find (i) current density in the copper wire (ii) drift velocity of free electrons in the aluminium wire. The number of free electrons per unit volume of aluminium wire is `10^(29) m^(-3)`.

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The correct Answer is:
`4.96xx10^(6) Am^(-2), 1.28xx10^(-4) ms^(-1)`
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