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                                    A metallic ring of radius 2cm and cross sectionalarea 4cm2 is fitted into a wooden circular diseof radius 4cm. If the Young's modulus of thematerial of the ring is2 x 10' N/m2, the forcewith which the metal ring expands is: | 
                            
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Answer»  r=2cm=2*10^-2m R=4cm=4*10^-2mA=4cm^2=4*10^-4m^2 Y=2*10^11N/m^2 F=AY(R-r)/r=4*10^-4*2*10^11(2*10^-2)/2*^10^-2F=8*10^7N  | 
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