Electric power - lesson 3

OUTCOME

By the end of the lesson you will recognise and explain the force created by a charged particle and a current carrying wire in a magnetic field.

The magnetic force on a moving charge is a result of the size of the charge (q), the strength of the field (B) and the speed of the particle (v). F = q v x B. The 'v x B' means cross product; they are the perpendicular components of these vectors.

Current in a wire is equivalent to a positive charge travelling at speed v into a field. The rule F = B x I l, will give the magnitude of the force and the right hand slap rule will give the direction

LEARNING TASKS

Explain

1. Draw a hand and label the correct parts to use the RH slap rule for F = qvxB

Explore and Elaborate

What's really going on here? Watch this video for a bit more detail

Prac: Magnetic swings

Activity: Electrons in Magnetic Fields

Evaluate

Jac Text Book - 2, 4, 5, 7, 8

2.Try this

3. Draw a hand and label the correct parts for the RH slap rule for F = BxIl.

5. Why would a moving electron experience a force in a magnetic field?