Question

the resistance of a wire is 20 ohm.it is so streched that the length becomes 3 times then what is the new resistance of the wire? any one there who can give right answer

Answer 1

R1=20 OHM                 L1=L1
R2=?                            L2=3L1

We know that, R $\alpha$ to l
therefore R2/R1 = L2/L1 ⇒R2/20=3L1/LI ⇒R2=20*3 ⇒R2 =60

Answer 2

Answer:

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Explanation:

r1 =20 ohm r2 =60