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Magnetism And Matter — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMagnetism And Matter1 Mark
MCQ
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

Correct option: B.
$A$ is true but $B$ is false.
A paramagnetic material is placed in a magnetic field.
$Þ$ If the magnetic field is increased, the magnetization is increased.
$\therefore\text{Magnetiazation}\overrightarrow{\text{I}}=\frac{\text{Magnetic Moment}}{\text{volume}}=\frac{\overrightarrow{\text{M}}}{\text{V}}$
$Þ$ If the temperature is increaed, the magnetization is decreased.
Because susceptibility of a paramagnetic substance is inversely proportional to the absolute temperarue.
$\text{X}=\frac{\text{C}}{\text{T}}$
after curie temperature susceptibility varies with temperature as $\text{X}=\frac{\text{C}^1}{\text{T}-\text{T}_\text{C}}$

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