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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

`A Y(R//r)`

B

`AY (R-r)//r`

C

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

D

`Yr//A R`

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