A Rowland ring of mean radius 16 cm has 4000 turns of wire wound on a ferromagnetic
Channel: Doubtnut
Date: 29/03/2020

A Rowland ring of mean radius 16 cm has 4000 turns of wire wound on a ferromagnetic core of relative permeability 800 . What is magnetic field in the core for a magnetising current of 1.2 A ?