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A metal ring of initial radius r and cro...

A metal ring of initial radius r and cross-sectional area A is fitted onto a wooden disc of radius R > r. If Youngs modules of metal is Y then tension in the ring is

A

`(AYR)/( r)`

B

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

C

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

D

`(yr)/(AR)`

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