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#material response

2 public questions tagged with this topic.

Solenoid with Magnetic Core and Magnetic Properties

The primary reason a diamagnetic material develops a weak opposing magnetic moment in an external field is:

**Solenoid with magnetic core** produces field B = μ₀ μ_r n I inside, μ₀ = 4π×10⁻⁷ T·m/A, μ_r relative permeability, n = N/L turns per meter, I current. Core enhances field μ_r times, so given B, μ_r, n, current I = B/(μ₀ μ_r n) can be found, illustrating core effect on field strength. In diamagnetic materials, an external magnetic field induces orbital currents in atoms that oppose the applied field, per Lenz’s law. This results in a weak, negative magnetization, as all electrons contribute to this effect in materials with no net magnetic moment. Substituting values gives Induced currents opposing the field, which matches expected

Ref: NCERT > Physics Book > Magnetism and Matter > Solenoid with Magnetic Core and Magnetic Properties

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Magnetic Field Lines, Bar Magnet and Dipole Moment

A material placed in a magnetic field reduces the field inside it slightly due to:

**Magnetic dipole moment** quantifies strength and orientation of magnet, m = 2l × q_m where q_m pole strength. Field line concept visualizes B, with closed nature reflecting absence of magnetic monopoles, explaining non-intersection and continuity. Diamagnetic materials reduce the magnetic field inside them slightly because an external field induces weak currents that create an opposing magnetic moment, resulting in a small negative susceptibility and a minor field reduction. Substituting values gives Induced opposing magnetic moments, which matches expected magnitude for this magnetic configuration, confirming dipole field dependence on m/r³ and torque relation τ = m B sinθ.

Ref: NCERT > Physics Book > Magnetism and Matter > Magnetic Field Lines, Bar Magnet and Dipole Moment

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