1.

A metallic wire of length L and radius R is stretched to a length 2L. The Percentage change in the resistance of the wire is (1) 100%(2) 200%(3) 300%(4) 400%P.S. I found the answer to be 100% but answer key says its 300%, is the answer key wrong?

Answer»

ANSWER:

R=L/A

a/q

if WIRE is strached to 2L then,

R'=2L/A

R'=2R

therefore ANS will be 200%



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