A long solenoid is wound with turns per metre around a cylindrical soft-iron core…

PHYSICS · Subjective · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism

Problem

A long solenoid is wound with

800

turns per metre around a cylindrical soft-iron core whose relative permeability is

\mu_{r}=400

. What current should flow through the solenoid to obtain a magnetic field of

0.32\,\text{T}

inside the core?