A hollow cylinder of inner radius of 3cm and outer radius 5cm and a solid cylinder of radius 2cm are subjected to the same force. If they are made of same material and have same length the ratio of their elongation is
A
1:1
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B
1:2
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C
1:4
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D
2:3
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Solution
The correct option is C1:4
F=YAΔLL
Here , force is same , Y is same , L is same for both the cylinders, hence equation reduces to: A1(ΔL1)=A2(ΔL2)