A wire is wound on a long rod of material of relative permeability `mu_(r) = 4000` to
Channel: Doubtnut
Date: 2020-07-26

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 5 A and number of turns per unit length is 1000 per metre, then the magnetic field inside the solenoid is