An analogy can be drawn between the formulae related to a capacitor and inductor. Observe the similarity in various quantities that are related to the two. Example: To obtain a displacement current of 1 A across the plates of a 2 µF capacitor, the voltage across it should be varied at the rate of Answer: The expression for displacement current through a capacitor is Here, C is the capacitance and is rate of change of capacitor voltage. Substitute the known values.