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# 10.4 Chapter summary

## 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 Quantity Unit name Unit 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

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