What is "Inductive Capacitance", "Inductive Reactance" and "Capacitive Reactance"?

It seems there's a bit of confusion in the terms you've asked about. "Inductive capacitance" is not a standard term in the field of electronics or physics.

There are two distinct concepts that are fundamental to understanding electronics and electromagnetic fields: inductance and capacitance. I will explain each of these separately.

1. Inductance: This refers to the property of a conductor by which a change in current in the conductor induces a voltage in itself and in any nearby conductors.

This is most often encountered in the context of coils (or inductors). The inductance (L) of a coil is dependent on its physical characteristics - how many turns it has, its area, and its length. It's measured in henries (H). The induced voltage is given by Faraday's law of electromagnetic induction as:

E = -L * (dI/dt)

where E is the induced electromotive force (voltage), L is the inductance, and dI/dt is the rate of change of current with respect to time.

Inductors are used in various applications such as power supplies, transformers, radios, televisions, and digital communications systems.

2. Capacitance: Capacitance is the measure of a capacitor's ability to store an electric charge.

A capacitor is made of two conductive plates separated by an insulator (or dielectric).

When voltage is applied across the plates, an electric field is generated in the capacitor, and charge is stored. The capacitance (C) is given by the ratio of the charge (Q) stored in the capacitor to the voltage (V) across it:

C = Q/V

Capacitance is measured in farads (F).

Capacitors have a variety of uses in electronic and electrical systems, including filtering noise, tuning radios, and in power supplies where they smooth the output of rectifiers.

Often, inductance and capacitance are paired together in circuits to create LC circuits, also known as resonant circuits or tuned circuits.

These circuits are fundamental in many types of electronic devices, including radios and television sets, where they are used to tune to specific frequencies.

In a LC circuit, the resonance frequency (f) is given by:

 f = 1/(2*pi*sqrt(LC))

where L is the inductance, C is the capacitance, and pi is approximately 3.14159.

Now, let’s look at the other two terms you asked about.

"Inductive Reactance" or "Capacitive Reactance," these are indeed valid terms in electronics, and here's what they refer to:

1. Inductive Reactance (X_L): It is a measure of a coil's (or inductor's) opposition to alternating current (AC). Unlike resistance which opposes both direct current (DC) and AC, reactance only applies to AC. The inductive reactance increases with increasing frequency of the AC. The formula to calculate inductive reactance is:

   X_L = 2πfL

   where X_L is the inductive reactance, f is the frequency of the AC, and L is the inductance of the coil. The unit of inductive reactance is ohms.

2. Capacitive Reactance (X_C): It is the opposition that a capacitor offers to alternating current (AC). Like inductive reactance, capacitive reactance also applies only to AC. However, unlike inductive reactance, capacitive reactance decreases with increasing frequency of the AC. The formula to calculate capacitive reactance is:

   X_C = 1/(2πfC)

   where X_C is the capacitive reactance, f is the frequency of the AC, and C is the capacitance of the capacitor. The unit of capacitive reactance is ohms.

In an AC circuit, the impedance (Z) - which is the total opposition to current - is a complex quantity that comprises resistance (R) and reactance (either inductive or capacitive).

When both inductors and capacitors are present, the total reactance (X) is the difference between the inductive reactance and the capacitive reactance (X_L - X_C).

Please let me know if this clears the confusion you’ve had. If you have follow-up questions, I will be be more than happy to help you.