Magnetic Properties of Matter

A compass needle oscillates $20$ times per minute at a place where the dip is $30^{o}$ and $30$ times per minute where the dip is $60^{o}$. The ratio of total magnetic field due to the earth at two places respectively…

Three identical bars A, B and C are made of different magnetic materials. When kept in a uniform magnetic field, the field lines around them look as follows: Make the correspondence of these bars with their material…

Choose the correct sketch of the magnetic field lines of a circular current loop shown by the dot $$ \text { and the cross } \otimes \text {. } $$

A solenoid has a core made of material with relative permeability $400$. The magnetic field produced in the interior of solenoid is $1.0$ T. The magnetic intensity in SI units is $\alpha \times 10^5$. The value of…

The percentage increase in magnetic field (B) when space within a current carrying solenoid is filled with magnesium (magnetic susceptibility $\left.\chi_{\mathrm{mg}}=1.2 \times 10^{-5}\right)$ is :

Paramagnetic substances: A. align themselves along the directions of external magnetic field. B. attract strongly towards external magnetic field. C. has susceptibility little more than zero. D. move from a region of…

Given below are two statements: Statement I :The diamagnetic property depends on temperature. Statement II :The induced magnetic dipole moment in a diamagnetic sample is always opposite to the magnetising field. In the…

A magnet hung at$45^{\circ}$with magnetic meridian makes an angle of$60^{\circ}$with the horizontal. The actual value of the angle of dip is

A soft ferromagnetic material is placed in an external magnetic field. The magnetic domains:

The magnetic susceptibility of a material of a rod is$499.$Permeability in vacuum is$4\pi\times10^{-7}Hm^{-1}.$ Absolute permeability of the material of the rod is

Which of the following statements are correct? (A) Electric monopoles do not exist whereas magnetic monopoles exist. (B) Magnetic field lines due to a solenoid at its ends and outside cannot be completely straight and…

A magnetic compass needle oscillates$30$times per minute at a place where the dip is$45^{\circ}$ and$40$times per minute where the dip is$30^{\circ}$. If$B_{1}$and$B_{2}$are the net magnetic fields due to the earth at…