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A copper wire is stretched to make it 0.5% longer. The percentage change in its electrical resistance if its volume remains unchanged is:

a.

2.5%

b.

0.5%

c.

1.0%

d.

2.0%



Question ID - 50048 | SaraNextGen Top Answer

A copper wire is stretched to make it 0.5% longer. The percentage change in its electrical resistance if its volume remains unchanged is:

a.

2.5%

b.

0.5%

c.

1.0%

d.

2.0%

1 Answer
127 votes
Answer Key / Explanation : (c) -

R= and volume (v) = Al.

R=

  = =1%

127 votes


127