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Electricity Magnetism 3. Electromagnetism

CLASSICAL PHYSICS Electricity & magnetism. Electricity Magnetism 3. Electromagnetism. Forces of nature. Gravity. Nuclear (Strong & Weak). Electromagnetism. Projectiles Planets Galaxies Universe. Nucleus Radioactivity Stars. Light Atoms Technology.

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Electricity Magnetism 3. Electromagnetism

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  1. CLASSICAL PHYSICS Electricity & magnetism • Electricity • Magnetism • 3. Electromagnetism

  2. Forces of nature Gravity Nuclear (Strong & Weak) Electromagnetism Projectiles Planets Galaxies Universe Nucleus Radioactivity Stars Light AtomsTechnology

  3. Same rules everywhere in the universe Electric Force Attraction or repulsion between objects with charge Increases with charge of object(s) Decreases with distance between objects

  4. Electric Force (=> acceleration) • Constant Direction, increasing speede.g. Light bulb activation by electric current • Changing Direction, constant speed e.g. atomic stability from orbiting charge

  5. Same rules everywhere in the universe Magnetic Force Attraction or repulsion between moving objects with charge Increases with relative speed of object(s) Decreases with distance between objects

  6. Magnetism inside atoms Magnetism from electric current Electric current from magnetism

  7. Maxwell’s equations encapsulate all electric and magnetic phenomena (still) Who is really moving? Relative motion --> Electricity = Magnetism Electromagnetism Einstein: Maxwell’s equations inconsistent with Galilean Relativity (1 ± 1 rule for speeds) --> Beginning of modern physics

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