Exercise (Analytical Questions)

 If a wire in the earth’s magnetic field carries a current vertically downwards , it is possible to obtain a neutral point :- 

Diamagnetism is the _____  property of every material and it is generated due to mutual interaction between the applied magnetic field and orbital motion of electrons

 How the magnetic susceptibility (x_m) of diamagnetic, paramagnetic and feromagnetic substances depends on temperature (T). 

A magnetising field of $1500{\mathrm{Am}}^{-1}$ produces a magnetic flux of $2.4\times {10}^{-5} \mathrm{Wb}$ in a bar of iron of cross-section $0.2\times {10}^{-4}$ ${\mathrm{m}}^2$. Calculate the permeability and susceptibility of the bar.

A uniform magnetic field gets modified as shown below, when the specimans X and Y are placed in it. Identify the two specimans X and Y  

A uniform magnetic field gets modified as shown below, when the specimans X and Y are placed in it. State the reason for the behaviour of the field lines in X and Y. 

How will a dia-, para- and a ferromagnetic material behave when kept in a non-uniform external magnetic field ? Give two examples of each of these materials. Name two main characteristics of a ferromagnetic material which help us to decide its suitability for making an electromagnet. Which of these two characteristics should have high or low values for each of these two types of magnets ?

An iron rod of cross sectional area 4 cm² is placed with its length parallel to a magnetising field 1600 Am^–1. The flux through the rod is 4 × 10^–4 weber. Find out permeability of the material of the rod ?