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A metallic ring of radius r and cross-se...

A metallic ring of radius r and cross-sectional area A is fitted into a wooden circular disc of radius `R (R gt r)`. If the Young's modulus of the material of the ring is Y, the force with which the metal ring expands is

A

`(AY r_(2))/(r_(1))`

B

`(AY(r_(2)-r_(1)))/(r_(1))`

C

`(Y(r_(2)-r_(1)))/(Ar_(1))`

D

`(Yr_(1))/(Ar_(2))`

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The correct Answer is:
2
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