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Question

A steel ring of radius r and cross sectional area A is fitted onto a wooden disc of radius R(R>r). If the Young's modulus of steel is Y, then the force with which the steel ring is expanded is

A
AY(R/r)
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B
AY(Rr)/r
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C
(Y/A)[(Rr)/r]
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D
Yr/AR
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