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.
Explain why the reactance offered by a capacitor decreases with increasing frequency of an alternating voltage.
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The reactance offered by a capacitor decreases with increasing frequency because reactance (XC) is inversely proportional to the frequency of the alternating voltage, as given by the formula XC = 1/2πfC, where f is the frequency and C is the capacitance. As the frequency increases, the rate of change of voltage across the capacitor becomes faster, allowing it to charge and discharge more rapidly, reducing the opposition to current flow.
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