Magnetism and Matter

Subject matter experts of JagranJosh have developed chapter wise practice questions of Class 12th as per the relevancy of the chapter in the CBSE board exam. This practice set contains 10 questions with detailed explanations on “Chapter: Magnetism and Matter” of Physics.

  • Q1.The magnetic field of Earth can be modelled by that of a point dipole placed at the centre of the Earth. The dipole axis makes an angle of 11.3° with the axis of Earth. At Mumbai, declination is nearly zero.Then,

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  • Q2.In a permanent magnet at room temperature

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  • Q3.Consider the two idealized systems: (i) a parallel plate capacitor with large plates and small separation and (ii) a long solenoid of length L >> R, radius of cross-section. In (i) E is ideally treated as a constant between plates and zero outside. In (ii) magnetic field is constant inside the solenoid and zero outside. These idealized assumptions, however, contradict fundamental laws as below:

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  • Q4.S is the surface of a lump of magnetic material.

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  • Q5.The primary origin(s) of magnetism lies in

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  • Q6.A long solenoid has 1000 turns per metre and carries a current of 1 A. It has a soft iron core of μr = 1000. The core is heated beyond the Curie temperature, Tc.

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  • Q7.Essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding is due to

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