A copper wire of length 1m and radius 1 mm is joined in series with an iron wire of length 2 m and radius 3 mm and a current is passed through the wires. The ratio of the current density in the copper and iron wires is
A
2:3
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B
6:1
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C
9:1
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D
18:1
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Solution
The correct option is C 9:1 J=Iπr2;Jα1r2JCJI=[rIrC]2=[31]2JC:JI=9:1