⚡ Electromagnetism — Intro#

Scope — Electric charge, electric and magnetic fields, and the forces they exert on matter.

Key concepts#

• Electric charge — fundamental property of matter that produces electric forces.
• Electric field — region of space where a charge experiences a force.
• Magnetic field — field produced by moving charges and magnetic materials.

Seed Q&A triads#

• Q: What is electromagnetism concerned with?
  A: The interaction between electric charges, currents, and the electric and magnetic fields they generate.

• Q: How do electric forces differ from gravitational forces?
  A: Electric forces can attract or repel and are much stronger; gravity only attracts and is comparatively weak.

• Q: Why are electric and magnetic phenomena considered linked?
  A: Moving electric charges produce magnetic fields, and changing magnetic fields induce electric effects.

Quick activities#

• Sketch electric field lines around a positive and a negative point charge and compare their patterns.