Embibe Experts Solutions for Chapter: Magnetic Materials and Terrestrial Magnetism, Exercise 1: Exercise 1

Two points $A$ and $B$ are situated perpendicular to the axis of $4 \mathrm{cm}$ long bar magnet at distances $\mathrm{x}$ and $3\mathrm{x}$ from its centre on opposite sides. The ratio of magnetic inductions at $A$ and $B$ will be equal to

A magnetic dipole is placed horizontally with the north pole pointing towards north. The horizontal component of earth's magnetic field is $20 \mu T.$ If the neutral point is found at a distance of $20 \mathrm{cm}$ in the plane bisecting the dipole then the magnetic moment of the dipole is
(Assume ${\mu }_0=4\pi \times {10}^{-7}$ S.I. units)

A bar magnet of magnetic moment $4.0 \mathrm{A} {\mathrm{m}}^2$ is free to rotate about a vertical axis through its centre. The magnet is released from rest from East-West position. Kinetic energy of the magnet in North-South position will be $(B_H=25\mu T)$

At a certain place, the horizontal component of earth's magnetic field is $\frac{1}{\sqrt{3}}$ times the vertical component. The angle of dip at that place is

The strength of the Earth’s magnetic field is

A Jet plane is travelling west at $450$ metres per second. If the horizontal component of Earth's magnetic field is $4\times {10}^{-4}$ Tesla and angle of dip is $30°,$ Then the vertical component is

Relative permeability of iron is $5500$. Its magnetic susceptibility is

Electromagnets are made of soft iron because, soft iron has