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Magnetism and Matter Physics - Magnetism and Matter

Gujarat Board (GSEB) - STD 12 Science - Physics (GSEB - English Medium). 68 questions in this chapter.

Question types

Magnetism and Matter question types

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

68
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6
Question groups
5
Question types
Sample Questions

Magnetism and Matter questions

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

Q 42 Marks Questions2 Marks
Name two substances out of which magnetic susceptibility of one is positive and of other negative. What does negative magnetic susceptibility represent?
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Q 52 Marks Questions2 Marks
A bar magnet is kept in a uniform magnetic field such that its magnetic moment is at an angle with the direction of $\overrightarrow{ B }$. Write an expression for potential energy of this system. When it will be minimum?
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Q 93 Marks Question3 Marks
Magnetic moment of a small bar magnet is 0.24 newton metre tesla ${ }^{-1}$. Calculate magnetising field of the magnet at a distance of 10 cm from the centre of the magnet on its axis.
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Q 103 Marks Question3 Marks
0.5 A of current is flowing through a coil of 25 turns and area $200 cm^2$. What is the pole strength of 10 cm length of bar magnet whose magnetic moment is equal to magnetic moment of the coil?
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Q 131 Marks Question1 Mark
A magnet of magnetic moment m is first cut perpendicular to its length and then perpendicular to its breadth into n equal parts, then calculate magnetic moment of each part.
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Q 174 Marks Questions4 Marks
(a) An electron is revolving with a speed of 2 $\times 10^5 m / s$ in the orbit of radius $0.51 A$ in a hydrogen atom. Calculate the magnetic moment of the electron.
(b) Equivalent electric current due to orbital speed of electron.
(c) Magnetic field generated at the centre of the nucleus.
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Q 184 Marks Questions4 Marks
A bar magnet whose area of cross-section is $0.25 cm^2$ is kept in a magnetising field of intensity of $5000 A / m$. If magnitude of magnetic flux passing through the bar is $2.5 \times 10^{-5}$ weber, then calculate :(a) Magnetic induction (b) Magnetic susceptibility (c) Intensity of magnetisation.
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Q 194 Marks Questions4 Marks
If the radius of a circular current carrying coil is doubled and the current flowing through it is reduced to half, then what will be effect on magnetic moment?
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Q 20M.C.Q (1 Marks)1 Mark
A bar magnet of magnetic moment $m$ when kept in a maenetic field of intensity $\vec{B}$ experiences a torgue:
  • ✓
    $\vec{m} \times \overrightarrow{ B }$
  • B
    $\overrightarrow{ B } \times \vec{m}$
  • C
    $\vec{m} \cdot \overrightarrow{B}$
  • D
    $\frac{\vec{m} \times \vec{B}}{\sqrt{2}}$

Answer: A.

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Q 21M.C.Q (1 Marks)1 Mark
One bar magnet is kept in the direction of north-south such that its north pole is towards north.The direction of points of zero magnetic field is towards which side of the centre of the magnet:
  • A
    north-south
  • ✓
    east-west
  • C
    north-east and south-west
  • D
    north-west and south-cast

Answer: B.

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Q 22M.C.Q (1 Marks)1 Mark
Relative electrical conductivity and relative magnetic permeability of a substance is $\in_r$ and $\mu_r$ What are the probable values of these quantities for any dimagnetic substance?
  • ✓
    $\in_r=1.5 \quad \mu_r=0.5$
  • B
    $\in_r=0.5 \quad \mu_r=0.5$
  • C
    $\in_r=1.5 \quad \mu_r=1.5$
  • D
    $\in_r=0.5 \quad \mu_r=1.5$

Answer: A.

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Q 23M.C.Q (1 Marks)1 Mark
Magnetic moment of a small bar magnet is $1.2 A- m ^2$. Magnetisation field at a distance of 0.1 m on its axis is :
  • A
    $1.2 \times 10^{-4} T$
  • ✓
    $2.4 \times 10^{-4} T$
  • C
    $2.4 \times 10^{4} T$
  • D
    $1.2 \times 10^{4} T$

Answer: B.

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Q 24M.C.Q (1 Marks)1 Mark
When two bar magnets are coaxially placed at some distance from each other, then no torque works because:
  • A
    There is no force on its poles
  • B
    Forces acting on their poles is parallel and their lines of action do not coincide.
  • C
    Forces on their poles are perpendicular to each other
  • ✓
    Forces on their poles are along the same line

Answer: D.

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Q 275 Marks Questions5 Marks
By explaining diamagnetic, paramagnetic and ferromagnetic substances, analyse their characteristic properties.###Define diamagnetic, paramagnetic and ferromagnetic substances and analyse their characteristics on the basis of (a) reason for magnetic property (b) relative magnetic permeability (c) magnetic susceptibility (d) intensity of magnetisation (e) magnetic induction.
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Q 285 Marks Questions5 Marks
Compare three magnetic substances on the basis of following properties :
(i) Behaviour in magnetic field
(ii) Main reason for magnet formation
(iii) Behaviour in non-uniform magnetic field
(iv) Behaviour on bringing magnetic pole near
(v) Magnitude of $\mu_r$
(vi) Number of field lines passing through substance in magnetic field
(vii) Direction of magnetisation.
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Q 295 Marks Questions5 Marks
Define the following and establish relation between them : (i) intensity of magnetisation (ii) magnetisation field (H) (iii) magnetic susceptibility $\chi$, (iv) magnetic permeability.###Explain permeability, susceptibility, intensity of magnetisation and magnetisation field $( H )_{ X }$ and state their units. Establish relation between them in M.K.S. system.
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