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Permanent Magnets — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsPermanent Magnets1 Mark
MCQ
Pick the correct options:
  1. Magnetic field is produced by electric charges only.
  2. Magnetic poles are only mathematical assumptions having no real existence.
  3. A north pole is equivalent to a clockwise current and a south pole is equivalent to an anticlockwise current.
  4. A bar magnet is equivalent to a long, straight current.
  • ✓
    $A$ and $B$
  • B
    $B$ and $C$
  • C
    $C$ and $D$
  • D
    Only $D$
✓

Answer

Correct option: A.
$A$ and $B$
Justification of $(a)$ and $(b):$
Investigators and experimenters have failed to find any sign of magnetic monopoles. So, we can assume that magnetic monopoles are only a mathematical assumption.
A magnetic field is produced by the motion of an electric charge only. In paramagnets or ferromagnets, the motion of an electron $($charge$)$ and the alignment of domains $($bunch of charges with particular alignment$)$ create paramagnetism and ferromagnetism, respectively.
Therefore, the only cause behind the magnetic field is the motion of an electric charge.
Denial of $(c):$
The north pole is equivalent to an anticlockwise current and the south pole is equivalent to a clockwise current.
Denial of $(d):$
A bar magnet is not equivalent to a long, straight current because the distribution and orientation of magnetic field lines do not resemble each other.

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