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Magnetism And Matter — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMagnetism And Matter1 Mark
MCQ
When is the angle of dip at a place equal to $45^{\circ}$ ?
  • ✓
    When the vertical and horizontal components of earth’s magnetic field are equal.
  • B
    When the vertical component is twice the horizontal component of earth’s magnetic field.
  • C
    When the vertical component is half the horizontal component of earth’s magnetic field.
  • D
    When either the vertical component or the horizontal components of earth’s magnetic field is equal to zero.
✓

Answer

Correct option: A.
When the vertical and horizontal components of earth’s magnetic field are equal.
Yes, the angle of dip at a place is equal to $45^\circ$, when the vertical and horizontal components of earth’s magnetic field are equal. In this case $\rightarrow δ=45^\circ$
$\tan\delta=\frac{\text{B}_\text{v}}{\text{B}_\text{v}}=1$
So, $B_v=B_H$.

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