66 A ring of mean radius 15 cm has 3500 turns of wire wound

Last updated: 6/10/2023

66 A ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800 The magnetic field in the core for a magnetising current of 1 2 A is a 2 48 T b 3 48 T d 5 48 T c 4 48 T 67 A solenoid has a core of a material with relative