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Question

The Young's modulus of brass and steel are respectively 1.0×1010N/m2 and 2×1010N/m2. A brass wire and a steel wire of the same length are extended by 1 mm under the same force, the radii of brass and steel wires are RB and RS respectively. Then

A
RS=2RB
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B
RS=RB2
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C
RS=4RB
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D
RS=RB4
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Solution

The correct option is A RS=RB2
Given, young modulus of brass =1010 N/m2 Young modulus of steel =2×1010 N/m2 Both wires have same length and extended by 1 mm under same force.

F=YB(πRB2)(ΔLL)F=YS(πR2S)(ΔLL)YB(RB)2=YS(RS)2RB=2RS Hence, option B is the correct answer.

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