Physics Electromagnetism BUMHS 2022
PMDC Verified Question 33 of 58
A magnetic field is produced by:
A
Moving charges
B
Stationary charges
C
Both 'A' and 'B'
D
Only ions
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Moving charges
Concept:

Electromagnetism defines that magnetic fields are strictly the relativistic result of electric charges in motion (currents).

Solution:

  • A stationary charge creates an electrostatic field in space, but no magnetic field.


  • When a charge moves, it forms an electric current.


  • According to Biot-Savart Law and Ampere's Law, a current (moving charge) induces a circulating magnetic field around its path.


  • Therefore, only moving charges produce magnetic fields.


Why other options are incorrect:

Option B is false because stationary charges lack the necessary velocity. Option C is false for the same reason. Option D is too restrictive; moving electrons, protons, and other charged particles also produce magnetic fields, not just ions.

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