AIIMS2002Physics-Electricity
AIIMS 2002 Physics Resistance MCQ Question
Type: MCQ-numerical-Medium-Class 12
When a wire is stretched and its radius becomes r/2, then its resistance will be
A
16R
B
2R
C
4R
D
0
Correct Answer
Option A
Detailed Explanation
Initial radius of wire, r1 = r and final radius of wire, r2 = r/2 = 0.5r. Since volume of the wire after stretch remains constant, therefore l1r1 = l2r2.
Found an issue with this question?