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Magnetic Properties of Matter Physics - Magnetic Properties of Matter

MP Board (MPBSE) - STD 12 Science - Physics (Madhya Pradesh - English Medium). 29 questions in this chapter.

Question types

Magnetic Properties of Matter question types

29 questions across 6 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

29
Questions
6
Question groups
5
Question types
Sample Questions

Magnetic Properties of Matter questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
The permanent magnetic moment of the atoms of a material is zero. The material:
  • A
    Must be paramagnetic.
  • ✓
    Must be diamagnetic.
  • C
    Must be ferromagnetic.
  • D
    May be paramagnetic.

Answer: B.

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Q 2M.C.Q (1 Marks)1 Mark
The desirable properties for making permanent magnets are:
  • ✓
    High retentivity and high coercive force.
  • B
    High retentivity and low coercive force.
  • C
    Low retentivity and high coercive force.
  • D
    Low retentivity and low coercive force.

Answer: A.

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Q 3M.C.Q (1 Marks)1 Mark
A perpendicular material is place in a magnetic fields. Consider the following statemetns:
If the magnetic field is increased, the magnetization is increased.
If the temperature is increased, the magnetization is increased.
  • A
    Both A and B are true.
  • ✓
    A is true but B is false.
  • C
    B is true but A is false.
  • D
    Both A and B are false.

Answer: B.

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Q 4M.C.Q (1 Marks)1 Mark
The magnetic susceptibility is negative for:
  • A
    Pramagnetic materials only.
  • ✓
    Diamagnetic materials only.
  • C
    Ferromagnetic materials only.
  • D
    Paramagnetic and ferromagnetic materials.

Answer: B.

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Q 5M.C.Q (1 Marks)1 Mark
Which of the following pairs has quantities of the same dimensions?
  • A
    Magnetic field $B$ and magnetizing field intensity $H.$
  • B
    Magnetic field $B$ and intensity of magnetization $I.$
  • C
    Magnetizing field intensity $H$ and intensity of magnetization $I.$
  • ✓
    Longitudinal strain and magnetic susceptibility.

Answer: D.

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Q 61 Marks Question1 Mark
The coercive force for a certain permanent magnet is $4.0 × 10^4A/m$. Thia magnet is placed inside a long solenoid of 40 turns/cm and a current is passed in the solenoid to demagnetise it completely. Find the current.
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Q 92 Marks Questions2 Marks
Assume that each iron atom has a permanent magnetic moment equal to 2 Bohr magnetons (1 bohr magneton equals $9.27 \times 10^{-24}A-m^2).$ The density of atoms in iron is $8.52 \times 10^{28}$ atoms/m$^3.$​​​​​​​
  1. Find the maximum magnetization I in a long cylinder of iron.
  2. Find the maximum magnetic field B on the axis inside the cylinder.
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Q 123 Marks Question3 Marks
The magnetic intensity Hat the centre of a long solenoid carrying a current of 2.0A, is found to be 1500A/m. Find the number of turns per centimetre of the solenoid.
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Q 133 Marks Question3 Marks
A rod is inserted as the core in the current-carrying solenoid of the previous problem.
  1. What is the magnetic intensity H at the centre?
  2. If the magnetization I of the core is found to be 0.12Nm, find the susceptibility of the material of the rod.
  3. Is the material paramagnetic, diamagnetic or ferromagnetic?
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Q 155 Marks Questions5 Marks
The magnetic field inside a long solenoid having 50 turns/cm is increased from 2·5 × 10.3T to 2.5T when an iron core of cross-sectional area $4cm^2$ is inserted into it. Find:
  1. The current in the solenoid.
  2. The magnetization I of the core.
  3. The pole strength developed in the core.
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Q 165 Marks Questions5 Marks
The magnetic field B and the magnetic intensity H in material are found to be 1.6T and 1000A/m reepectively. Calculate the relative permeability $\mu_\text{r}$ and the susceptibility x of the material.
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Q 175 Marks Questions5 Marks
When a dielectric is placed in an electric field, it gets polarized. The electric field in a polarized material is less than the applied field. When a paramagnetic substance is kept in a magnetic field, the field in the substance is more than the applied field. Explain the reason of this opposite behaviour.
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Q 185 Marks Questions5 Marks
A rod, when suspended in a magnetic field, stays in the east-west direction. Can we be sure that the field is in the east-west direction? Can it be in the north-south direction?
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