Learning Goals

The Biot-Savart Law

Long Straight Wires

Ampere's Law

Solenoids and Torroids

Magnetic Flux

Gauss's Law for Magnetism

Displacement Current

MU: Magnetic Fields

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Magnetic Fields:

All magnetic fields can be thought to be produced by electric currents. The relationship between a current and the magnetic field it produces is a little peculiar geometrically, and takes some getting used to. The law of Biot and Sarvart, the force between electric currents, and Ampere's law.

Learning Objectives

• Be able to state the law of Biot-Sarvart and use it to calculate the magnetic field due to a straight current-carrying wire and on the axis of a circular current loop.
• Know the definition of Ampere's law and be able to discuss its uses and limitations.
• Be able to calculate the forces between currents.
• Be able to state the various units of magnetic field strength.
• Be able to show that the magnetic field cannot do work.