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Magnetic Properties of Matter Physics - Magnetic Properties of Matter

MP Board (MPBSE) - STD 11 Science - Physics (Madhya Pradesh - English Medium). 31 questions in this chapter.

Question types

Magnetic Properties of Matter question types

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

31
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
When a ferromagnetic material goes through a hysteresis loop, the magnetic susceptibility:
  1. Has a fixed value.
  2. May be zero.
  3. May be infinity.
  4. May be negative.
  • A
    $A$ and $B$
  • B
    $B$ and $D$
  • C
    $A$ and $D$
  • ✓
    $B,C$ and $D$

Answer: D.

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Q 3M.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 4M.C.Q (1 Marks)1 Mark
A perpendicular material is place in a magnetic fields. Consider the following statemetns:
  1. If the magnetic field is increased, the magnetization is increased.
  2. 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 5M.C.Q (1 Marks)1 Mark
Pick the correct options.
  1. All electrons have magnetic moment.
  2. All protons have magnetic moment.
  3. All nuclei have magnetic moment.
  4. All atoms have magnetic moment.
  • A
    Only $A$
  • ✓
    $A$ and $B$
  • C
    $B$ and $C$
  • D
    All of these

Answer: B.

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Q 61 Marks Question1 Mark
The coercive force for a certain permanent magnet is $4.0 \times 10^4A/m$. 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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