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Physics chapters

Magnetism and Matter

4 JEE Main questions · Physics

  1. PhysicsJEE Main 23 Jan 2026, Shift 1·Q20·MCQ·Easy
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    Magnetic materials

    Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

    Consider a ferromagnetic material:

    Assertion (A): The individual atoms in a ferromagnetic material possess a magnetic dipole moment and interact with one another in such a way that they spontaneously align themselves forming domains.

    Reason (R): At high enough temperature, the domain structure of ferromagnetic material disintegrates. Thus, magnetization will disappear at high enough temperature known as Curie temperature.

    In the light of the above statements, choose the correct answer from the options given below:

    1. (1)(A) is true but (R) is false
    2. (2)Both (A) and (R) are true but (R) is not the correct explanation of (A)
    3. (3)Both (A) and (R) are true and (R) is the correct explanation of (A)
    4. (4)(A) is false but (R) is true
  2. PhysicsJEE Main 24 Jan 2026, Shift 1·Q21·Numerical·Easy–moderate
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    Bar magnet

    A short bar magnet placed with its axis at 30∘30^\circ with an external field of 800 Gauss, experiences a torque of 0.016 N.m. The work done in moving it from most stable to most unstable position is α×10−3\alpha\times10^{-3} J. The value of α\alpha is .
  3. PhysicsJEE Main 4 Apr 2026, Shift 2·Q14·MCQ·Easy–moderate
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    Magnetic materials

    A solenoid has a core made of material with relative permeability 400. The magnetic field produced in the interior of solenoid is 1.0 T. The magnetic intensity in SI units is α×105\alpha\times10^{5}. The value of α\alpha is . (Free space permeability μ0=4π×10−7\mu_0 = 4\pi\times10^{-7} SI units).
    1. (1)25π\dfrac{25}{\pi}
    2. (2)116π\dfrac{1}{16\pi}
    3. (3)1π\dfrac{1}{\pi}
    4. (4)14π\dfrac{1}{4\pi}
    We corrected a printing error in the original paper

    Source printed “The magnetic intensity is SI units”.

  4. PhysicsJEE Main 4 Apr 2026, Shift 2·Q23·Numerical·Moderate
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    Bar magnet

    Two identical small bar magnets each of dipole moment 35 J/T3\sqrt5\ \mathrm{J/T} are placed at a center to center separation of 10 cm, with their axes perpendicular to each other as shown in figure. The value of magnetic field at the point P midway between the magnets is α×10−3\alpha\times10^{-3} T. The value of α\alpha is . (μ0=4π×10−7\mu_0 = 4\pi\times10^{-7} Tm/A)