Electromagnetism

Electromagnetism is a branch of physics that deals with the interaction between electric currents and magnetic fields. It is a fundamental force of nature and plays a crucial role in various technological applications.

Key Concepts

Magnetic Field: A region around a magnetic material or a moving electric charge within which the force of magnetism acts.
Electric Current: Flow of electric charge through a conductor.
Electromagnetic Induction: The process of generating an electromotive force (emf) in a closed circuit by changing the magnetic field around the circuit.
Electromagnet: A type of magnet in which the magnetic field is produced by an electric current.

Study Guide

1. Magnetic Field

Understand the concept of a magnetic field and how it is produced by magnets and electric currents. Learn about the direction and strength of magnetic fields.

2. Electric Current and Magnetism

Explore the relationship between electric currents and magnetic fields. Study how a current-carrying wire generates a magnetic field around it.

3. Electromagnetic Induction

Learn about the phenomenon of electromagnetic induction and how a changing magnetic field can induce an electric current in a circuit. Understand Faraday's law of electromagnetic induction.

4. Electromagnets

Examine the construction and applications of electromagnets. Understand how the strength of an electromagnet can be controlled by varying the current passing through its coils.

Real-World Applications

Explore the real-world applications of electromagnetism, such as electric motors, generators, transformers, and magnetic resonance imaging (MRI) machines.