Physics Alternating Current ETEA 2015
PMDC Verified Question 112 of 127
For the production of electromagnetic waves, the electric charges must be:
A
Stationary charges
B
Charges moving with uniform velocity
C
Accelerating charges
D
All of these
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Accelerating charges
Concept:

Stationary charges produce static electric fields, charges in uniform motion produce steady magnetic fields, and accelerated charges radiate electromagnetic energy.

Formula / Reaction:

$$a = \frac{dv}{dt} \ne 0 \implies \text{Electromagnetic radiation}$$

Solution:

  • An accelerating charge creates time-varying electric and magnetic fields that propagate outward as electromagnetic waves.


Why other options are incorrect:

  • Opt_A: Stationary charges produce only electrostatic fields.


  • Opt_B: Uniform motion produces constant magnetic fields without radiation.


  • Opt_D: Only accelerated charges radiate.

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