A wire is wound on a long rod of material of relative permeability `mu_(r)=4000` to make a solenoid.
Channel: Doubtnut
Date: 2020-01-26

A wire is wound on a long rod of material of relative permeability `mu_(r)=4000` to make a solenoid.If the current through the wire is `5A` and number of turns per unit length is `1000` per metre,then the magnetic field inside the solenoid is: