List of top Physics Questions on Magnetism and matter

A bulk magnetic material has volume \[ 2\,\text{m}^3 \] and its magnetization is found to be \[ 2\,\text{A m}^{-1}. \] Then the magnetic moment of the bulk material is
A bar magnet of magnetic moment \(1.8\ \mathrm{Am^2}\) is free to rotate about a vertical axis passing through its centre at a place where the vertical component of earth's magnetic field is \[ 0.3\times10^{-4}\text{ T} \] and the dip angle is \(45^\circ\). If the magnet at rest in east-west direction is released, then the kinetic energy (in \(\mu\)J) of the magnet when it reaches north-south direction is
Find the formula for the couple acting on a magnetic dipole placed in a magnetic field. On its basis, define magnetic dipole moment.
What is the difference between paramagnetic and diamagnetic substances?
What is the difference between paramagnetic and diamagnetic materials?
By giving the examples, explain the meaning of diamagnetic and paramagnetic materials.
Find the formula for the work done in rotating a magnetic dipole in a uniform magnetic field through an angle \( \theta \). What will be the work done in rotating a magnetic dipole lying parallel to the magnetic field by an angle of \( 180^\circ \)?
The magnetic susceptibility of a diamagnetic material is
If the susceptibility of a paramagnetic substance at a temperature of \(23^\circ C\) is \(2.3\times10^{-5}\), then its susceptibility at a temperature of \(467^\circ C\) is:
If magnetic field at equator is 0.4 G, earth's magnetic dipole moment is of order: (R = 6400 km)
A bar magnet of magnetic moment $1.5A\,m^{2}$ is initially placed in the direction of a uniform magnetic field of $18\times10^{-2}$ T. The work to be done to rotate the magnet so that its magnetic moment becomes perpendicular to the direction of the magnetic field is}
The work done in turning a magnetic dipole of magnetic moment \(M\) in a magnetic field \(B\) by an angle \(90^\circ\) from the meridian is \(n\) times the corresponding work done in turning it through an angle of \(60^\circ\) in the same field and from the same initial condition. Find the value of \(n\).
The magnetic field at a point A on the axis of a short bar magnet is $1500\%$ more than the magnetic field at a point B on the normal bisector of the magnet. If the distance of point A from the centre of the magnet is $18\text{ cm}$, then the distance of point B from the centre of the magnet is:
A thin conducting wire of length $L$ carrying a current of $2\text{ A}$ is bent into a square loop of $2$ turns and another thin conducting wire of length $2L$ carrying a current of $3\text{ A}$ is bent into a circular loop of $3$ turns. If the magnetic moment of the circular loop is $\frac{4}{\pi}\text{ A}\cdot\text{m}^2$, then the magnetic moment of the square loop is:
If the horizontal component of earth's magnetic field at a place is $2.8 \times 10^{-5}$ T and the magnetic field of the earth at this place is $5.6 \times 10^{-5}$ T, then the inclination at the place is:
The magnetic susceptibility is negative for:
If a paramagnetic bar is brought near a bar magnet, then it is
Two identical circular current loops carrying equal currents are placed with their axes inclined at 45\(^{\circ}\) to each other as shown in the figure. The resultant magnetic field at P is
For an electron of mass $m_e$ and charge $e$ revolving around the nucleus of an atom, the ratio of its angular momentum to magnetic moment is
Which law states that magnetic susceptibility is inversely proportional to absolute temperature?
According to Curie’s Law, what happens to magnetic susceptibility if absolute temperature is doubled?
A Bar magnet has a magnetic moment M and length l. If its length is reduced to half, find its new magnetic moment.
Assertion: For a diode in reverse bias, current is independent of applied voltage before breakdown and it increases drastically just after breakdown.
Reason: Before breakdown only majority charge carriers flow.
A Zener diode has a voltage rating of 10 volts and the maximum power drop across the Zener diode is 0.5 watt. What resistance (in Ohm) should be connected in series with the Zener diode so that it can be operated safely by a battery of 25 volts?
In PN junction, if P side is highly doped and N side is lightly doped, then