Multiple choice

Displacement current is

  1. the current that comes into play in the region in which electric and magnetic field changes, and hence the electric flux is constant

  2. the current that comes into play in the region in which electric and magnetic field changes, and hence the electric flux is changing with time

  3. the current that is produced with changing electric field only

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Displacement current (Id = ε0(dΦE/dt)) is the current that appears in regions where the electric field and electric flux are changing with time. It was introduced by Maxwell to complete Ampere's law and explains how electromagnetic waves can propagate through empty space. Option A incorrectly states that electric flux is constant - the key is that it must be changing with time.

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