a 70 turn coil with average diameter of 0.02 m is placed perpendicular to magnetic field of 9000 T . if the magnetic field is changed to 6000 T in 3sec , what is the magnitude of the induced emf


Dear Student ,
                       we know that e=-dϕdt=-ϕthereϕ=B.A=BAcos(θ)=BAcos(0)=BA (normal of coil is parallel to magnetic field)ϕ1=B1 A=9000×70×π×r2=9000×70×3.14×(0.02)2 =71.28ϕ2 =B2 A=6000×70×π×r2=6000×70×3.14×(0.02)2 =527.52soe=- 527.52-791.283 =87.92V 
Regard

  • -34
What are you looking for?