Vardaan Learning Institute

The SI unit of magnetic dipole moment is ________.

Outside a bar magnet, magnetic field lines run from the ________ pole to the ________ pole.

Inside a bar magnet, magnetic field lines run from the ________ pole to the ________ pole.

A freely suspended bar magnet aligns itself in the roughly ________ direction.

The formula for magnetic potential energy of a dipole in a uniform magnetic field is $U =$ ________.

The torque on a magnetic dipole $\vec{m}$ in a uniform magnetic field $\vec{B}$ is:

At which angle is a magnetic dipole in stable equilibrium in a magnetic field?

Two magnetic field lines:

A current-carrying solenoid behaves like a:

Magnetic dipole moment is a:

The magnetic length of a bar magnet is slightly less than its geometric length. (True/False)

Work done in rotating a dipole from angle $\theta_1$ to $\theta_2$ is $mB(\cos\theta_1 - \cos\theta_2)$. (True/False)

Match the physical quantities in Column A with their formulas in Column B:

Column A (Quantity)	Column B (Formula)
(P) Torque ($\tau$)	(1) $NIA$ (or $m$)
(Q) Potential Energy ($U$)	(2) $mB\sin\theta$
(R) Magnetic Moment of coil	(3) $-mB\cos\theta$

According to Gauss's law for magnetism, the net magnetic flux through any closed surface is ________.

The mathematical expression for Gauss's law in magnetism is $\oint \vec{B} \cdot d\vec{S} =$ ________.

Gauss's law in magnetism indicates that isolated magnetic ________ do not exist.

Which of the following is strictly true for magnetic lines of force?

The absence of magnetic monopoles means:

If a bar magnet is cut into two equal halves transversely (perpendicular to its length), we get:

If an electric dipole is enclosed in a Gaussian surface, the net electric flux is zero. If a magnetic dipole is enclosed, the net magnetic flux is:

The net magnetic flux through a sphere containing a bar magnet is positive. (True/False)

Magnetic poles always exist in equal and opposite pairs. (True/False)

The angle between the geographic meridian and the magnetic meridian at a place is called magnetic ________.

The angle made by the Earth's total magnetic field $\vec{B}$ with the horizontal direction is called angle of ________.

At the magnetic equator, the angle of dip is ________.

At the magnetic poles, the angle of dip is ________.

The horizontal component of Earth's magnetic field is $B_H =$ ________.

The vertical component of Earth's magnetic field $B_V$ is given by (where $I$ is angle of dip):

The relation between total magnetic field $B$, horizontal component $B_H$, and vertical component $B_V$ is:

If $B_H = B_V$ at a specific place, the angle of dip at that place is:

A dip circle shows an angle of $90^\circ$ when placed at the:

The Earth's magnetic field at the surface is approximately of the order of:

Magnetic declination is constant and remains the same at all places on Earth. (True/False)

A compass needle points exactly along the geographic north pole everywhere on Earth. (True/False)

Match the Earth's magnetic parameters:

Column A	Column B
(P) Angle of Dip at Magnetic Equator	(1) $\tan I$
(Q) Angle of Dip at Magnetic Poles	(2) $0^\circ$
(R) Ratio of $B_V / B_H$	(3) $90^\circ$

Materials that are feebly repelled by a strong magnet are called ________ materials.

Materials that are strongly attracted by a magnet are called ________ materials.

The magnetic susceptibility ($\chi$) of a diamagnetic substance is small and ________ (positive/negative).

Above the ________ temperature, a ferromagnetic substance transitions and behaves like a paramagnetic material.

Relative permeability ($\mu_r$) for a ferromagnetic material is ________ (very large / very small).

Which of the following is a diamagnetic material?

Which of the following is a classic example of a ferromagnetic material?

The magnetic susceptibility ($\chi$) of a paramagnetic material is:

When a diamagnetic substance is brought near the north or south pole of a strong bar magnet, it is:

For a paramagnetic material, the relative permeability ($\mu_r$) is:

Diamagnetism is a universal property present in all atomic materials. (True/False)

Curie's law states that the magnetization of a paramagnetic material is directly proportional to its absolute temperature. (True/False)

Match the material with its susceptibility ($\chi$):

Column A (Material Type)	Column B (Susceptibility $\chi$)
(P) Diamagnetic	(1) Large positive ($\chi \gg 1$)
(Q) Paramagnetic	(2) Small negative ($-1 < \chi < 0$)
(R) Ferromagnetic	(3) Small positive ($\chi > 0$)

The phenomenon of lagging of magnetic induction ($B$) behind the magnetizing field ($H$) is called ________.

The value of magnetization left in a ferromagnetic material when the external magnetizing field is reduced to zero is called ________.

The reverse magnetizing field required to completely demagnetize a material ($B=0$) is called ________.

Electromagnets should have high permeability and ________ (high/low) retentivity.

Materials used for making permanent magnets should have high retentivity and ________ (high/low) coercivity.

Soft iron is preferred for making cores of electromagnets and transformers because it has:

The area enclosed by the hysteresis loop ($B-H$ curve) represents:

Steel is preferred over soft iron for making permanent magnets because of its:

A ferromagnetic substance with a very narrow hysteresis loop is suitable for:

What happens to a ferromagnetic substance if it is heated beyond its Curie temperature?

Coercivity is a measure of how easily a magnetic material can be demagnetized. (True/False)

Energy is dissipated in the form of heat during each complete cycle of magnetization and demagnetization. (True/False)