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A steel ring of radius r and cross secti...

A steel ring of radius r and cross section area A is fitted on to a wooden disc of radius `R(Rgtr)`. If Young's modulus be R, then the force with which the steel ring is expanded is

A

`(AYR)/(r)`

B

`(AY(R-r))/(r)`

C

`Y/A ((R-r))/(r)`

D

`(Yr)/(AR)`

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The correct Answer is:
B
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