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Electromagnetic Waves — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectromagnetic Waves1 Mark
MCQ
Which of the following statement(s) is/ are correct?
  • A
    Conduction current obeys Ohm's law whereas displacement current does not.
  • B
    Conduction current is the actual current whereas displacement current is the apparent current produced by time varying electric field.
  • C
    Conduction current density is represented by $\overrightarrow{\text{J}_\text{c}}=\sigma\overrightarrow{\text{E}}$ whereas displacement current density is given by $\overrightarrow{\text{J}_\text{d}}=\frac{\overrightarrow{\delta\text{E}}}{\delta\text{t}};\sigma=$ conductivity of the element, $\overrightarrow{\text{E}}=$ electric field.
  • D
    All of the above
✓

Answer

  1. Conduction current obeys Ohm's law whereas displacement current does not.

Explanation:

Displacement current is the current that occurs due to charging electric field  introduced by maxwell. It depends on the frequency of electric field while conduction current follows ohms law, requires medium displacement.Current doesnot follow ohms law nor require medium.

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