Answer :


Given-


Radius of cross section of the wire used in the previous


problem = r



Young’s modulus of the metallic wire = Y.



It said in the question that, when the applied magnetic field is switched off, the tension in the wire increased and so iyd length is increased.



We know Young’s modulus,



we know, stress is, s is –



and strain



Young’s modulus,




Area of circle



Let, a be the radius of loop



from (1)



Now the tensile force will be the magnetic force acting on a conductor of length l given by –



where,


B= magnetic field


I = current


a =differential length of the wire


and θ = the angle between B and a





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