Magnetism and matter practice · Mixed difficulty

Assertion(A): Steel is attracted by a magnet.

Reason (R): Steel is not a magnetic substance.

The magnetic susceptibility of paramagnetic materials is

Intensity of magnetic field due to earth at a point inside a hollow steel box is

At a certain place the horizontal component of the earth’s magnetic field is ${B_0}$ and the angle of dip is 45$^ \circ$. The total intensity of the field at that place will be

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

Magnetic field intensity is defined as

The field due to a magnet at a distance $R$ from the centre of the magnet is proportional to

A vertical pillar of soft iron partially embedded in earth, at south pole, is found to be magnetized by the earth's magnetic field. The polarity at the top end of the pillar will be

Two magnets held together in earth’s magnetic field with same polarity together make 12 $\mathrm{vib } - {\min ^{ - 1}}\mathrm{and}$ when opposite poles together make 4 $\mathrm{vib } - {\min ^{ - 1}}.\mathrm{The}$ ratio of magnetic moments is

If the magnetic susceptibility of a specimen is small and positive, then the specimen is

The magnetic moment of a magnet of length $10\;cm$ and pole strength $4.0\;Am$ will be

At a certain place, the angle of dip is 30$^ \circ$ and the horizontal component of earth’s magnetic field is 0.50 oersted. The earth’s total magnetic filed (in oersted) is

The correct definition of Meissner effect is

Statement I Time period of oscillation of two magnets, when like poles are in same direction (in a vibration magnetometer) is smaller, than the period of vibration when like poles are in opposite direction.

Statement II Moment of inertia increases in same position.
In the light of the above statements, choose the most appropriate answer from the options given below.

A magnetic needle kept in a non-uniform
magnetic field, experiences

The pole strength of a bar magnet is $0.08Am$ and its length is $6cm$ then magnetic moment of a bar magnet is $\left[ {A - {m^2}} \right]$

The incorrect statement regarding the lines of force of the magnetic field $B$ is

Assertion (A) : The magnetic field lines are
continuous and form closed loops.
Reason (R) : Magnetic monopole does not exist.
The correct option among the following is

Assertion (A): Magnetism is relativistic.

Reason (R): When we move along with the charge, so that there is no motion relative to us, we find no magnetic field associated with the charge.

A magnet makes 40 oscillations per minute at a place having magnetic field intensity of $0.1 \times {10^{ - 5}}T$. At another place, it takes $2.5\;sec$ to complete one vibration. The value of earth’s horizontal field at that place is

A bar magnet of magnetic moment $M$ and moment of inertia $I$ is freely suspended such that the magnetic axial line is in the direction of magnetic meridian. If the magnet is displaced by a very small angle ($\mathrm{\theta }$), the angular acceleration is (Magnetic induction of earth’s horizontal field $= {B_H}$)

To shield an instrument from external magnetic field, it is placed inside a cabin made of

The dimensions of B is

A deflection magnetometer is adjusted in the usual way. When a magnet is introduced, the deflection observed is $\mathrm{\theta }$, and the period of oscillation of the needle in the magnetometer is $T$. When the magnet is removed, the period of oscillation is ${T_0}$.Find the relation between $T\;\mathrm{and}\;{T_0}$ is

The magnetic field of a small bar magnet varies in the following manner by the influence of a magnet placed at a large distance $d$.

A bar magnet is placed north-south with its north pole due north. The points of zero magnetic field will be in which direction from center of magnet

Assertion (A): Two short magnets are placed on a cork which floats on water. The magnets are placed such that the axis of one produced bisects the axis of other at right angles. Then the cork has neither translational nor rotational motion.
Reason (R): Net force on the cork is zero.

At a temperature of $30^\circ$ C, the susceptibility of a ferromagnetic material is found to be χ$χ$. Its susceptibility at $333^\circ$ C is

The magnetic needle of an oscillation magnetometer makes 10 oscillations per min under the action of earth’s magnetic field alone. When a bar magnet is placed at some distance along the axis of the needle, it makes 14 oscillations per min. If the bar magnet is turned so that its poles interchange their positions, then the new frequency of oscillation of the needle is

A bar magnet has a magnetic moment $2.5J{T^{ - 1}}$ and is placed in a magnetic field of $0.2T$. Calculate the work done in turning the magnet from parallel to antiparallel position relative to field direction is