Magnetism and matter practice · Mixed difficulty

The period of oscillation of a magnet at a place is 2 seconds. When it is remagnetised, so that the pole strength becomes 4 times the initial value. The period of oscillation in second is

For an isotropic medium $B,\;\mu ,\;H$ and $M$ are related as (where $B,\;{\mu _0},\;H$ and $M$ have their usual meanings in the context of magnetic material)

Assertion: Super conductors can be easily levitated in strong magnetic field.
Reason: Magnetic susceptibility of super conductor is extremely positive.

Substances, when placed in a magnetic field
acquire feeble magnetization in the direction
opposite to that of the applied field are called

The needle of a dip circle shows an apparent dip of $45^{\circ}$ in a particular position and $53^{\circ}$ when the circle is rotated through $90^{\circ}$. Find the true dip.

The magnetic susceptibility of a material of a rod is 499. The absolute permeability of vacuum is $4\pi \times {10^{ - 7}}\;\mathrm{H}{\mathrm{m}^{ - 1}}$. The absolute permeability of the material of a rod is

The magnetic moment of a diamagnetic atoms is:

A magnet of distance moment 2 J ${\mathrm{T}^{ - 1}}$ is aligned in the direction of magnetic field of 0.1 T. What is the net work done to bring, the magnet normal to the magnetic field?

The magnetic susceptibility of a paramagnetic material is $1.0 \times 10^{-5}$ at $27^0 \mathrm{C}$ Temperature. Then, at what temperature its magnetic susceptibility would be $1.5 \times 10^{-5}$ ?

Which of the following properties is 'False' for
a bar magnet ?

The oscillating electric and magnetic field vectors of electromagnetic wave are oriented along

The dimensions of B is

A dip needle vibrates in the vertical plane perpendicular to magnetic meridian. The time period of vibration is found to be 2 s. The same needle is then allowed to vibrate in the horizontal plane and time period is again found to be 2s. Then the angle of dip is

If there is no torsion in the suspension thread, then the time period of a magnet executing $\mathrm{SHM}$ is :

Meissner effect is related to

The relation between total magnetic field (B), magnetic intensity $(\mathrm{H})$, permeability of free space $\left(\mu_0\right)$ and susceptibility $(\chi)$ is

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show

A $3 {~cm} \times 10 {~cm}$ rectangular coil with number of turns 300 is placed in uniform magnetic field of strength $0.2 {~T}$. The maximum magnetic torque acting on it when a current of $10^{-4} {~A}$ is passed through it; 

Due to the earth’s magnetic field, charged cosmic ray particles

A bar magnet is characterized by

Assertion: If a unit north pole rotates around a current carrying wire then work has to be done.
Reason: Magnetic field produced by current is always non - conservative in nature.

A magnet placed in the magnetic meridian with its north pole pointing north of the earth produces a neutral point at a distance of $0.15 \mathrm{~m}$ from either pole. It is then broken into two equal pieces and one such piece is placed in a similar position. Find the position of the neutral point.

Assertion (A): Electromagnets are made of soft iron.

Reason (R): Coercivity of soft iron is small.

If the susceptibility of dia, para and ferro magnetic materials are $\chi_{\mathrm{d}}, \chi_{\mathrm{p}}, \chi_{\mathrm{f}}$ respectively, then

In the magnetic meridian of a certain place, the horizontal component of the Earth's magnetic field is $86.6 \mathrm{~G}$ (Gauss) and the magnetic field of earth is $100 \mathrm{~G}$ (Gauss). Then the dip angle is

$\chi_1$ and $\chi_2$ are susceptibility of a paramagnetic material at temperatures $T_1\,K$ and $T_2\,K$ respectively, then :

A hydrogen atom is paramagnetic. A hydrogen molecule is

The unit of $\frac{\mu_{0}}{4 \pi}$ is

A thin magnetic needle oscillates in a horizontal plane with a period $\mathrm{T}$. It is broken into $n$ equals parts. The time period of each part will be

The hysteresis cycle for the material of permanent magnet is