Q5 of 31 Page 286

The susceptibility of annealed iron at saturation is 5500. Find the permeability of annealed iron at saturation.

Given:


Susceptibility of iron at saturation=5500=


We know that permeability (μ ) is related to susceptibility (


By the given formula



Where,


=absolute permeability of vacuum=4π × 10-7 henry/metre


Putting the values of and in the above equation



henry/m



More from this chapter

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3

The magnetic field inside a long solenoid having 50 turns cm–1 is increased from 2.5 × 10–3 T to 2.5 T when an iron core of cross-sectional area 4 cm2 is inserted into it. Find

(a) the current in the solenoid,


(b) the magnetization I of the core and


(c) the pole strength developed in the core.


 4

A bar magnet of length 1 cm and cross-sectional area 1.0 cm2 produces a magnetic field of 1.5 × 10–4 T at a point in end-on position at a distance 15 cm away from the centre.

(a) Find the magnetic moment M of the magnet.


(b) Find the magnetization I of the magnet.


(c) Find the magnetic field B at the centre of the magnet.


 6

The magnetic field B and the magnetic intensity H in a material are found to be 1.6 T and 1000 A m–1 respectively. Calculate the relative permeability μr and the susceptibility of the material.

7

The susceptibility of magnesium at 300 K is 1.2 × 10–5. At what temperature will the susceptibility increase to 1.8 × 10–5?