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A metallic rod of radius 2cm and cross s...

A metallic rod of radius `2cm` and cross sectional area `4cm^(2)` is fitted into a wooden circular disc of radisu `4cm`. If the Young's modulus of the materail of the ring is `2xx10^(11) N//m^(2)`, the force with which the metal ring expands is:

A

`2xx10^(7)N`

B

`8xx10^(7)N`

C

`4xx10^(7)N`

D

`6xx10^(7)N`

Text Solution

Verified by Experts

The correct Answer is:
B
Length to be doule `e = l, F = (Yae)/(l)`
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