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Q.

If a wire of 1 ohm resistance is stretched to double its length, then the resistance will become

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a

12 Ω

b

2 Ω

c

1 Ω

d

4 Ω

answer is D.

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Detailed Solution

R=ρlA; lA=2lA1A1=A2R1=ρ2lA/2=4R=4Ω
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If a wire of 1 ohm resistance is stretched to double its length, then the resistance will become