Is capacitance constant?

Hint:Let us first review the definition of capacitance before moving on to the question. The ratio of the quantity of electric charge stored on a conductor to the difference in electric potential is known as capacitance. Self-capacitance and mutual capacitance are two closely related concepts in capacitance. Self-capacitance is a property of anything that may be electrically charged.

Complete step by step answer:
Yes, capacitance is strictly a constant for a given capacitor. It is independent of the charging source's EMF or the charges on the plates at any given time.
The capacitance is determined by two variables. The first and most important is plate geometry, which encompasses plate size, separation, relative orientation, and shape.
The permittivity of the material medium intervening between the plates (i.e. the dielectric constant/ relative permittivity of the medium) is the second factor to consider.
If a dielectric media completely fills the space between the plates, the capacitance increases by a factor of the dielectric constant (of the medium).
This occurs because polarised fields within the dielectric tend to partially cancel the influence of the electric field between the plates, and therefore the potential.
The amount of charge held remains constant, implying that the capacitance has risen. (That is, for the same difference in potential between the two sites, more charge can be stored.)

Note:In a circuit, capacitors serve a variety of critical purposes. They are helpful in power supply circuits and bypass applications because of their capacity to store DC charge and offer low impedance to alternating frequency signals.