Displacement Current — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Displacement Current This current exists in regions where the electric field is changing over time, such as in the gap between the plates of a charging capacitor. Maxwell modified Ampere's Law to account for changing electric fields. The original Ampere's Law only accounted for conduction current (I). Maxwell postulated that a changing electric flux ( d E dt ) acts as a source of magnetic field lines. This source is quantified as the displacement current ( I d ), leading to the full equation: I = I conduction + I d . 0 must be the permittivity of free space (vacuum). The rate of change of electric flux must be finite. Confusing displacement current with conduction current (which requires physical charge movement). Assuming that changing magnetic flux ( d B dt ) is responsible for displacement current (it is the changing electric flux that matters here). Forgetting the proportionality constant 0 in the calculation.