A piece of wire is stretched to reduce its diameter to half of its original value its resistance will become
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Resistance is inversly propotional to area of material. In the sense diametre is inversly propotional to resistance by its square.
ie; R~1/A or R~1/D2
Thus new resistance becomes 4 times its original resistance when diametre of given wire is halfed.
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Answer:
16 R₁
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