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Question
Physics
If a copper wire is stretched to increase its length by 20 %. The percentage increase in resistance of the wire is %.
Q. If a copper wire is stretched to increase its length by
20%
. The percentage increase in resistance of the wire is _______
%
.
918
140
JEE Main
JEE Main 2023
Current Electricity
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Answer:
44
Solution:
As volume is constant,
So resistance
∝
(length
)
2
⇒
%
change in resistance
=
20
+
20
+
100
400
=
44%