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Understanding Fields in Physics: Gravity, Electricity, and Magnetism

This overview explores the concept of fields in physics, where a body experiences a force due to external influences. Fields can be gravitational, electric, or magnetic, each associated with mass or charge. Gravitational fields exert forces on masses, electric fields act on charges, and magnetic fields impact moving charges. The direction of these forces is determined by field lines and can be visualized using rules like the Left Hand Rule for magnetic fields. Understanding field strengths and directions is crucial in physics.

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Understanding Fields in Physics: Gravity, Electricity, and Magnetism

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Presentation Transcript

  1. IB Physics SL Fields(Topic 6)

  2. What are fields? A field is a region where a body experiences a force: Field Source of field Body affected Gravitational Mass Mass Electric Charge Charge Magnetic Moving charge* Moving charge *Note that the magnetic field created by a permanent magnet is due to the motion of electrons in the substance

  3. Field Strengths * No need to learn (1A of current, wire perpendicular to field)

  4. Field direction (Field lines) Gravitational: Direction of force on test mass Electrical: Direction of force on a positive test charge Magnetic: Direction the N pole of a compass would point. LHR – Left hand rule.

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