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#1 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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#2 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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#3 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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#4 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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#5 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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#6 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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#7 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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#8 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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#9 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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#10 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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#11 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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#12 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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#13 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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#14 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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#15 Class 12 Physics Magnetism and Matter 2023 Long 1M CBSE

Assertion: A paramagnetic sample displays greater magnetisation (for the same magnetic field) when cooled. Reason: The magnetisation does not depend on temperature.

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#16 Class 12 Physics Magnetism and Matter 2022 Long 1M CBSE

Assertion: Diamagnetic materials can exhibit magnetism. Reason: Diamagnetic materials have permanent magnetic dipole moment.

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#17 Class 12 Physics Magnetism and Matter 2021 Mcq 1M CBSE

The relative magnetic permeability of substance X is slightly less than unity and that of substance Y is slightly more than unity. Then

A. X is paramagnetic and Y is ferromagnetic

B. X is diamagnetic and Y is ferromagnetic

C. X and Y both are paramagnetic

D. X is diamagnetic and Y is paramagnetic

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#18 Class 12 Physics Magnetism and Matter 2020 Short 1M CBSE

If $\chi_{m1}$ and $\chi_{m2}$ are the susceptibilities of a diamagnetic substance at temperatures $T_1$ and $T_2$ respectively, what is the relation between them?

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#19 Class 12 Physics Magnetism and Matter 2019 Mcq 1M CBSE

Substances which are strongly attracted by a magnetic field and move from weaker to stronger regions of the field are termed as

A. diamagnetic substances

B. paramagnetic substances

C. ferromagnetic substances

D. non-magnetic substances

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#20 Class 12 Physics Magnetism and Matter 2018 Mcq 1M CBSE

Domain formation is a necessary feature of

A. diamagnetism

B. paramagnetism

C. ferromagnetism

D. all of these

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