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

A steel ring of radius r and cross section A is fitted on to a wooden disc of radius `R(R gt r)`. IF young's modulus be E, then the force with which the steel rings is expanded is

A

`AER/r`

B

`(Er)/(AR)`

C

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

D

`AE((R-r)/r)`

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The correct Answer is:
D
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