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WBJEE 2015 Physics Solved Paper

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Question : 10

Total: 40

A metal wire of circular cross-section has a resistance R1. The wire is now stretched without breaking so that itslength is doubled and the density is assumed to remain the same. If the resistance of the wire now becomes R2then R2 : R1 is

1 : 1
1 : 2
4 : 1
1 : 4

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