NCERT Physics Class 12 Exemplar Ch 5 Magnetism and Matter Part 2 (For CBSE, ICSE, IAS, NET, NRA 2023)
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One or More Than Multiple Choice Type Questions
Q. 6 is the surface of a lump of magnetic material.
- Lines of are necessarily continuous across .
- Some lines of must be discontinuous across .
- Lines of are necessarily continuous across .
- Lines of cannot all be continuous across .
Answer: (A, D)
Q. 7 The primary origin of magnetism lies in
- Atomic currents.
- Pauli Exclusion Principle.
- Polar nature of molecules.
- Intrinsic spin of electron.
Answer: (A, D)
Q. 8 A long solenoid has turns per meter and carries a current of . It has a soft iron core of . The core is heated beyond the Curie temperature, .
- The field in the solenoid is (nearly) unchanged but the field decreases drastically.
- The fields in the solenoid are nearly unchanged.
- The magnetization in the core reverses direction.
- The magnetization in the core diminishes by a factor of about .
Answer: (A, D)
Q. 9 Essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding is due to
- Electrostatic field lines can end on charges and conductors have free charges.
- Lines of can also end but conductors cannot end them.
- Lines of cannot end on any material and perfect shielding is not possible.
- Shells of high permeability materials can be used to divert lines of from the interior region.
Answer: (A, C, D)
Q. 10 Let the magnetic field on earth be modelled by that of a point magnetic dipole at the center of earth. The angle of dip at a point on the geographical equator
- Is always zero.
- Can be zero at specific points.
- Can be positive or negative.
- Is bounded.
Answer: (B, C, D)