Topic 1 Magnetic Field

Define the (a) magnitude and (b) direction of a magnetic field in terms of the force acting on a moving charge.

Topic 2 Current carrying wire

Show that the force acting on a current carrying wire is proportional to the current in the wire, the length of the wire, and the strength of the magnetic field.

Topic 3 Faraday's Law

(a) Define magnetic flux.

(b) State Faraday's law.

Examples

A 2 C charge is traveling north at 11 m/s through a vertical magnetic field and experiences a 0.5 N force as a result. What is the magnitude and direction of the magnetic field?

A wire passing through the poles of a magnet experiences a force of 0.11 N when the ends of the wire are touched to the terminals of a battery. If the magnetic field is 0.5 T over 10 cm of the wire, what is the current in the wire?

If, in the above example, the wire is disconnected from the battery and allowed to swing back through the poles of the magnet at, say, 20 cm/s, what will be the emf between the ends of the wire?

Textbook Problems