A solenoid has a core of a material with relative permeability 400 . The windings of the solenoid are insulated from the core and carry a current of 4 ~A . If the number of turns is 500 per metre, then the magnetizing field is

Step-by-step solution

aligned & Given, I =4 ~A , n =500 ~m ⁻¹, _ r =400 & Magnetic intensity, H = nI =500 4 & =2000 Am ⁻¹ & _ r =1+ and = ( _ r -1 ) & Magnetising field, M = H = ( _ r -1 ) H & =(400-1) 2000=399 2000=7.98 10^5 Am ⁻¹ aligned