8 Why is it necessary to introduce a cylindrical soft iron

Last updated: 6/25/2023

8 Why is it necessary to introduce a cylindrical soft iron core inside the coil of a galvanometer 7 9 0 77 i when the magnetic field is radial as in the case of cylindrical pole pieces and soft iron core then in every position of coil the plane of the coil is parallel to the magnetic field lines so the coil experiences a uniform torque on it as deflection torque NIAB c ii when the magnetic field is radial as in the case of cylindrical pole pieces and soft iron core then in every position of coil the plane of the coil is perpendicular to the magnetic field lines so the coil experiences a non uniform torque on it and SO deflection torque NIAB iii when the magnetic field is radial as in the case of cylindrical pole pieces and soft iron core then in every position of coil the plane of the coil is in axial line to the magnetic field lines so the coil experiences a maximum torque on it as deflection torque c NIAB iv None of the above