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Question

A cylindrical wire is compressed in length by 10. The percentage decrease in the resistance will be

A
16%
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B
19%
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C
20%
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D
25%
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Solution

The correct option is B 19%
ll90100
R=e×LA
L=0.9l
A=1.1A
R=P0.9L1.1A=0.81R
change is resistance is =10.8
=0.19
=19%.

1194704_1158143_ans_57142b908dca4a74ba24c8a436013fe7.jpg

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