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10.4 Chapter summary (ESBQ4)

Presentation: 2426

  • Electromagnetism is the study of the properties and relationship between electric currents and magnetism.

  • A current-carrying conductor will produce a magnetic field around the conductor.

  • The direction of the magnetic field is found by using the Right Hand Rule.

  • Electromagnets are temporary magnets formed by current-carrying conductors.

  • The magnetic flux through a surface is the product of the component of the magnetic field normal to the surface and the surface area, \(\phi = BA\cos(\theta)\).
  • Electromagnetic induction occurs when a changing magnetic field induces a voltage in a current-carrying conductor.

  • The magnitude of the induced emf is given by Faraday's law of electromagnetic induction: \(\mathcal{E}=-N\frac{\Delta\phi}{\Delta t}\)

Physical Quantities
QuantityUnit nameUnit symbol
Induced emf (\(\mathcal{E}\))Volt\(\text{V}\)
Magnetic field (\(B\))Tesla\(\text{T}\)
Magnetic flux (\(\phi\))Weber\(\text{Wb}\)
Time (\(t\))seconds\(\text{s}\)

Table 10.1: Units used in electromagnetism