A metal wire with initial length and resistance is stretched uniformly to three times…
PHYSICS · Single correct · A Level · Physics · Electricity · Electricity
Problem
A metal wire with initial length ℓ0 and resistance R0 is stretched uniformly to three times its original length. During the process, its volume remains constant and the temperature is unchanged. What is the wire’s new resistance?
(a) 6R0
(b) 9R0
(c) 3R0
(d) 27R0