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Question 24

A Rowland ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. What is the magnetic field B in the core for a magnetising current of 1.2 A?


Mean radius of a Rowland ring, r= 15 cm = 0.15 m

Number of turns on a ferromagnetic core, N= 3500

Relative permeability of the core material, μr=800

Magnetising current, I= 1.2 A

The magnetic field is given by the relation:



ü0= Permeability of free space = 4π× 10 - 7Tm A - 1

Therefore, the magnetic field in the core is 4.48 T.

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