Magnetic Materials And Susceptibility

Question

A material that is weakly repelled by an external magnetic field and possesses a small negative magnetic susceptibility is best classified as

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NCERT Class 12, Chapter 5 (Magnetism and Matter) classifies magnetic materials by their susceptibility $\chi$, which relates magnetisation to the applied field. Diamagnetic materials have a small negative susceptibility, so they are weakly repelled and tend to move toward weaker field regions; examples include bismuth, copper, and water. Paramagnetic materials have a small positive susceptibility and are weakly attracted, so this option is incorrect for a repelled substance. Ferromagnetic materials such as iron have a very large positive susceptibility and are strongly attracted, contradicting weak repulsion. Ferrimagnetic materials also show net positive magnetisation and attraction, so they too are ruled out. Because the defining features here are 'weakly repelled' and 'negative susceptibility', only diamagnetism fits both. Plausibility check: a negative $\chi$ means the induced magnetisation opposes the applied field, and an opposing magnetisation naturally produces repulsion, so the sign of susceptibility and the observed repulsion are consistent, confirming the diamagnetic classification.

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Magnetic Materials And Susceptibility

Select the correct option:

🔒 Solution Hidden from View

More magnetic effects of current and magnetism Practice Questions

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About This Question

Solution

The magnetic susceptibility of a paramagnetic sample is measured as $0.006$ at a temperature of $300...

In a region with a uniform electric field of $3 \times 1 0^{4}$ V/m perpendicular to a magnetic field...

A circular loop of radius $R$ carries current $I$ ; the magnetic field at an axial point located a di...

A galvanometer of resistance $50 Ω$ shows full-scale deflection at $2$ mA; what shunt resistan...

A rectangular coil of $50$ turns and area $2 \times 1 0^{- 2}$ m $^{2}$ carries a current of $1.5$ A whil...

To convert a galvanometer of resistance $60 Ω$ and full-scale current $5$ mA into a voltmeter ...

A bar magnet of magnetic moment $0.8$ A·m $^{2}$ is held at $3 0^{\circ}$ to a uniform magnetic field of...