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#1 Class 12 Physics Magnetism and Matter 2021 Short 2M CBSE
Calculate the work done in rotating a bar magnet of magnetic moment 3 J·T$^{-1}$ through an angle of 60° from its position along a magnetic field of strength $0.34 \times 10^{-4}$ T.
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#2 Class 12 Physics Magnetism and Matter 2020 Short 3M CBSE
A bar magnet of length 0.1 m has a pole strength of 50 A·m. Calculate the magnetic field at a distance of 0.2 m from its centre on: (i) its axial line, (ii) its equatorial line.
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#3 Class 12 Physics Magnetism and Matter 2022 Short 2M CBSE
A bar magnet of length $L$ and magnetic dipole moment $M$ is bent in the form of an arc subtending an angle of 60° at its centre. What will be the new magnetic dipole moment?
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#4 Class 12 Physics Magnetism and Matter 2021 Short 3M CBSE
A current of 7.0 A flows in a plane circular coil of radius 10 cm having 100 turns placed in a uniform magnetic field of 0.2 Wb·m$^{-2}$. What orientations correspond to (1) stable equilibrium and (2) unstable equilib...
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#5 Class 12 Physics Magnetism and Matter 2022 Short 3M CBSE
Two identical magnetic dipoles of magnetic moment 1.0 A·m$^2$ each are placed at a separation of 2 m with their axes perpendicular to each other. Find the resultant magnetic field at the point mid-way between the dipo...
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#6 Class 12 Physics Magnetism and Matter 2021 Short 2M CBSE
A bar magnet of magnetic moment 6.4 A·m$^2$ is placed in a uniform magnetic field of 0.4 T. What is the torque acting on the magnet when its axis makes an angle of 60° with the magnetic field?
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#7 Class 12 Physics Magnetism and Matter 2020 Short 5M CBSE
Derive an expression for the magnetic field due to a magnetic dipole in the broadside-on (equatorial) position at a distance $r$ from its centre. The length of the dipole is $2l$ and its magnetic moment is $M$.
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#8 Class 12 Physics Magnetism and Matter 2022 Short 5M CBSE
Derive an expression for the magnetic field intensity at a point on the axial line of a bar magnet. What is the direction of the field?
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#9 Class 12 Physics Magnetism and Matter 2022 Long 5M CBSE
Draw the magnetic field lines distinguishing between diamagnetic and paramagnetic materials. Give a simple explanation to account for the difference in their magnetic behaviour.
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#10 Class 12 Physics Magnetism and Matter 2020 Short 2M CBSE
State Gauss's law of magnetism. What are its important consequences?
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#11 Class 12 Physics Magnetism and Matter 2008 Short 2M CBSE
Two identical iron bars A and B are given, one of which is definitely known to be magnetised. How would you ascertain whether both are magnetised, or only one?
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#12 Class 12 Physics Magnetism and Matter 2019 Short 2M CBSE
Define magnetic dipole and magnetic dipole moment. What are their units?
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#13 Class 12 Physics Magnetism and Matter 2007 Short 2M CBSE
An iron bar is heated to 1000°C and then cooled in a magnetic field-free space. Will it retain its magnetism? Give reason.
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#14 Class 12 Physics Magnetism and Matter 2021 Short 3M CBSE
Derive the relation between relative magnetic permeability $\mu_r$ and magnetic susceptibility $\chi_m$.
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#15 Class 12 Physics Magnetism and Matter 2020 Short 2M CBSE
A magnetic needle suspended freely in a uniform magnetic field experiences a torque but no net force. An iron nail near a bar magnet experiences both a force of attraction and a torque. Why?
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#16 Class 12 Physics Magnetism and Matter 2021 Short 3M CBSE
(1) How does a diamagnetic material behave when cooled to very low temperature? (2) Why does a paramagnetic sample display greater magnetisation when cooled? Explain.
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#17 Class 12 Physics Magnetism and Matter 2020 Short 2M CBSE
State two characteristic properties distinguishing the behaviour of paramagnetic and diamagnetic materials.
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#18 Class 12 Physics Magnetism and Matter 2019 Short 2M CBSE
Why does a magnetic dipole possess potential energy when placed at some inclination with the direction of the magnetic field?
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#19 Class 12 Physics Magnetism and Matter 2018 Short 2M CBSE
Why cannot two magnetic field lines due to a bar magnet cross each other?
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#20 Class 12 Physics Magnetism and Matter 2019 Short 1M CBSE
The permeability of a magnetic material is 0.9983. Name the type of magnetic material it represents.
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