A Rowland rign of mean radius `18cm` has `3500` turns of wire wound on a ferromagnetic
Channel: Doubtnut
Date: 2020-08-02

A Rowland rign of mean radius `18cm` has `3500` turns of wire wound on a ferromagnetic core of relative permeability `800`. What is the magnetic field in the core for a magnetising current of `1*2amp`.?