NEET2017Physics-Current Electricity
NEET 2017 Physics Resistance MCQ Question
Type: MCQ-numerical-Medium-Class 12
The resistance of a wire is ‘R’ Ω. If it is melted and stretched to ‘n’ times its original length, its new resistance will be:-
A
nR
B
n²R
C
R/n
D
n²
Correct Answer
Option B
Detailed Explanation
Resistance is proportional to the length squared when the volume remains constant. Thus, stretching the wire increases resistance by n².
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