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0. A conducting wire of certain length has its resistance R1. When it is stretched to have its diameter reduced to half its original value, what would be its new resistance R2 in comparison to R1? (NTSE Odisha, Stage-I, 2015-16)
R2 = 16R1
R2 = 8R1
R2 = 4R1
R2 = 2R1
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