# Self-Inductance

Self-inductance (L) is the ability of a circuit to oppose the magnetic flux that is produced by the circuit itself

Running a changing current through a circuit creates a changing magnetic field, which creates an induced emf that fights the change

Units are henrys (H)

Self-inductance is purely a function of the circuit's geometry

# Calculating Self Inductance

Ratio of magnetic flux to current flow

For inductor:

For capacitor:

# Example 1: Self Inductance of s Solenoid

Calculate the self-inductance of a solenoid of radius r and length L with N windings

# Example 2: Calculating Self Inductance

Calculate the self-inductance of a solenoid with 3400 turns of wire if the solenoid is 9 cm long and has a diameter of 11 cm.

# Inductor, Capacitor, and Resistor