Magnetic Properties of Matter

A paramagnetic sample shows a net magnetization of $8$ A/m when placed in an external magnetic field of $0.6$ T at a temperature of $4$ K. When the same sample is placed in an external magnetic field of $0.2$ T at a…

A magnetic material has a relative permeability $(\mu_r)$ of $6001$. If it is placed in a magnetizing field (magnetic intensity) of $H = 2000\ \text{A/m}$, The total magnetic induction $(B)$ inside the material is…

There are four lightweight rod samples P, Q, R and S separately suspended by thread. A bar magnet is slowly brought near to each sample and the following observations are noted (a) P is weakly repelled (b) R is strongly…

In an experiment, the interior of a first current-carrying toroid with $1000$ turns per unit length is filled with aluminum (susceptibility $2.4 \times 10^{-5}$). A second, identical toroid with $500$ turns per unit…

Which of the following statements is INCORRECT for diamagnetic materials? a. Relative permeability is less than one. b. Magnetic susceptibility is negative and low. c. Magnetic susceptibility does not depend on the…

Magnetic susceptibility ($\chi$) is related to magnetic relative permeability ($\mu_r$) by the relation

A magnetizing field of $360\ \text{A/m}$ produces a magnetic flux density $B = 0.6\ \text{T}$ in a ferromagnetic material. The permeability of the material in T-m/A is

A magnetizing field of $10^3\ \text{A/m}$ produces a magnetic flux density $4\pi$ T in an iron rod. The relative permeability of the rod will be (permeability of free space $\mu_0 = 4\pi \times 10^{-7}$ SI units)

The magnetic induction produced at the centre of the air-core solenoid is $B_0$. If the air-core is replaced by an iron-core of susceptibility $\chi$, the magnetic induction is $B_1$. The ratio of $\dfrac{B_1}{B_0}$ is

A thin bar magnet of length $2 L$ is bent at the mid-point so that the angle between them is $60^{\circ} \mathrm{C}$. The new length of the magnet is

Two points $A$ and $B$ are situated at distance $x$ and $2 x$ respectively from the nearer pole of a magnet 2 cm long. The ratio of magnetic field at $A$ and $B$ is

A magnet makes 40 oscillations per minute at a place having magnetic field intensity $B_H=0.1 \times 10^{-5}$. At another place, it takes 2.5 s to complete one vibration. The value of the earth's horizontal field at the…