Electricity and Magnetism Simulations

Electricity and magnetism deal with electric charge and the forces and fields it produces, a domain in which most of the important quantities are invisible. For this reason animated simulations are especially useful, because they can draw field lines, show charges in motion, and display how circuits respond over time. Electrostatics covers charges at rest and the forces between them: like charges repel, unlike charges attract, and the surrounding electric field describes the influence a charge exerts on others nearby.

Magnetism is closely linked to electricity. A moving charge or an electric current produces a magnetic field, which is the principle behind the electromagnet, a coil of wire that becomes magnetic when current flows through it. The connection works in both directions. Faraday's law of electromagnetic induction states that a changing magnetic field through a coil induces a voltage in it, so moving a magnet near a coil generates a current. This relationship underlies generators, transformers, and many other devices.

Simulations can also model how electric and magnetic effects combine in time-varying systems. An electromagnetic oscillating circuit, made from an inductor and a capacitor, exchanges energy back and forth between the magnetic field of the coil and the electric field of the capacitor, producing oscillations analogous to a swinging pendulum. By representing electric force fields, the behavior of charges, and the action of coils visually, these tools make the abstract laws of electromagnetism easier to grasp and explore.

Frequently asked questions

What does Faraday's law of induction describe?

It states that a changing magnetic field through a coil induces a voltage in that coil, which is the basis of electric generators and transformers.

How does an electromagnet work?

An electric current flowing through a coil of wire produces a magnetic field, so the coil acts as a magnet only while the current flows.

What happens in an electromagnetic oscillating circuit?

Energy moves back and forth between a coil's magnetic field and a capacitor's electric field, producing electrical oscillations much like a pendulum swinging.