Question

A copper wire of certain length has a resistance of 10 ohm. What will be its resistance after strectching to double its length​

Answer 1

Answer:

Resistance will become 4 times .ie.40 ohm

Answer 2

Answer:

40ohm

R = p L/A

V = A×L

Area = V/L

R = p l^2/V

R ~ L^2

length Doubled

R ~ 4L^2

means 4 times

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