Explain why the reactance offered by a capacitor decreases with increasing frequency of an alternating voltage.

We know that a capacitor does not allow of direct current through it because the gap between the two plates of capacitor offers an infinite resistance. when an alternating voltage is applied across a capacitor, the capacitor plates are alternately charged and discharged. As a resultof this changing charge (and hence potontial a current is established through the capacitor. it is therefore clear that a capacitor will pass more current through it if the charge (or voltage)is changing at a faster rate i.e, the frequency of alternating voltage supply is higher. it means that the reactance offered by a capacitor dec.