Question

a wire of length 10 m has resistance 100 w . if wire streched to increase length is three times , what will be its new resistance ?
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Answer 1

Answer:

300 ohm

both have same specific resistance so

r1*a/l1=r2*a/l2

r1/l1=r2/l2

100/10=r2/30 (l2=3*l1)

r2=300