Physics Concepts on Reactance and Magnetism

A set of flashcards covering key concepts from the lecture notes on reactance, magnetism, and electromagnetic induction.

What is reactance in the context of AC circuits?

Reactance is the opposition to the flow of alternating current offered by a capacitor or inductor.

What are the two types of reactance?

Inductive reactance (XL) and capacitive reactance (XC).

How is inductive reactance (XL) calculated?

XL = 2πfL, where f is the frequency and L is the inductance.

What is capacitive reactance (XC) and its formula?

It is the opposition to the flow of current through a capacitor, calculated by XC = 1/(2πfC), where C is the capacitance.

What is the basic behavior of magnets?

Every magnet has two poles, north and south, and like poles repel while unlike poles attract.

What happens when a magnet is freely suspended and displaced?

It will always return to align itself with the magnetic north direction.

What defines the direction of magnetic field lines?

Magnetic field lines originate at the north pole and terminate at the south pole.

What is the concept of magnetic induction?

Magnetic induction is the process by which certain materials become magnetized in the presence of a magnetic field.

What is Faraday's Law of Electromagnetic Induction?

The induced electromotive force (emf) in a circuit is directly proportional to the rate of change of magnetic flux through the circuit.

What does Lenz's Law state?

Lenz's Law states that the direction of induced current is such that it opposes the change in magnetic flux that produced it.