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Q.

A copper wire of length 1m and radius 1mm is connected in series with another wire of iron of length 2 m and radius 3mm. A steady current is passed through this combination. The ratio of current densities in copper and iron wires will be 

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a

18:1

b

2:3

c

6:1

d

9:1

answer is B.

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Detailed Solution

J1A1=J2A2
J1J2=A2A1=91

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