1.

A uniform circular wire hasresistance 15 ohm. If the length ofwire is doubled by stretching it. Whatis its resistance as the volume of wireis same.

Answer»

R=pl/aLet, L=2l A=a/2 (for keeping same volume), R=pL/A 15=pL/AWe have to find, r=pl/aSo, 15=pL/A 15=p2l/(a/2)

15=p 2l2/a15=p 4l/a15/4 = pl/aSo, r=15/4



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