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 metallic ring of radius r and cross-sectional area A is fitted into

1.	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
Answer» ANSWER :`(YA(R-r))/(r)`