Does capacitance change with frequency?

Answer 1

No, Capacitance does not change with frequency.

Capacitance of a capacitor is given as: #C=Q/V# It is simply the charge stored on the plates of a capacitor per unit voltage.

however, if you talk about the Capacitive Reactance #X_c# of a circuit, it indeed depends upon the frequency.

Capacitive reactance is given as: #X_c = 1/(2pifC)#

Thus, it is the #Capacitive# #Reactance# and #NOT# the #Capacitance# which depends upon #Frequency#.

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Answer 2

Emily Abbate

Yes, capacitance can change with frequency. This phenomenon is known as frequency dependence. In some capacitors, especially those with certain types of dielectric materials, the capacitance may increase or decrease as the frequency of the applied alternating current (AC) changes. This is due to factors such as the dielectric relaxation time and the impedance of the capacitor at different frequencies. However, in ideal capacitors with perfect dielectrics, the capacitance remains constant regardless of frequency.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.