MagIndGoals

MAGNETISM

Students should be able:

To descibe bassic magnetic phenomena (e.g. what will be the forces between magnets in various orientations or the torque on a magnet in some orientation near another magnet)
To describe how the interactions between magnets is like the interaction between electric dipoles
To describe an experiment that would show that magentic forces are not the same thing as electric forces (e.g. that magnets are not actually just permanent electric dipoles)
To explain how we can define the direction and strength of a magnetic field using a test magnet.
To qualitatively describe the magnetic field at various locations around a magnet or around the Earth.

To qualitatively describe the magnetic field near a moving charge, and various configurations of current-carrying wire (long straight wire, loop, solenoid)
To give the orientation of a magnet or the direction of the current in a wire given the magnetic field produced.
To determine the cross product of two vectors
To determine the direction and magnitude of the magnetic field at any location near a moving charge or current-carrying wire, inside a solenoid, or in the center of a loop of current-carrying wire
To use the principle of superposition to find the magnetic field at a point due to a collection of moving charges/currents/etc...

To calculate the magnitude and direction of the fore on a moving charge in a magnetic field
To describe the trajectory of a charge that is initially moving perpendicular to a uniform magnetic field
To describe the trajectory of a charge that is initially moving at some angle to a uniform magnetic field
To determine the magnitude and direction of the force on a current-carrying wire
To determine the torque on a loop of current-carrying wire in a constant magnetic field
To determine the direction/magnitude of the force on a moving charge near a specified configuration of current-carrying wire
To qualitatively describe the forces between current-carrying wires or magnets and current-carrying wires (for straight wires, loops, etc...)

To explain how the strength of a magnet can be quantified (or describe an experiment to determine the relative strength of two magnets)
To determine the torque on a magnet in a uniform field given its magnetic moment.
To describe a simple design for an electric motor and explain how/why it works

To explain why the flux of the magnetic field through any closed surface is zero
To calculate the line integral of a magnetic field in simple cases (e.g. straight line path through constant magnetic field, paths where magnetic field is everywhere parallel or perpendicular to path)
To verify that Ampere's Law is satisfied in simple cases (circular loop around a current-carrying wire, rectangular loop through a solenoid) or explain how Ampere's Law could be used to determine the strength of a magnetic field for a long straight wire or solenoid.

MAGNETIC INDUCTION

The behaviour of currents and fields generated by moving charges and fields.

Students should be able to:

Regognize situations in which current will be induce due to a changing magnetic flux
Predict the direction of induced currents using Lenz's law

Motional Electromotive Force (emf)

Describe qualitatively and quantitatively (using the Lorentz force law) why a motional emf appears in a conductor moved through a magntic field.
Calculate the current generated by a motional emf in a conductor and rail system.
Find the direction of the force caused by the induced current.
Calculate the magnitude of the force caused by the induced current

Explain the underlying mechanism for Faraday's law both in the situation where the loop of conductor is changing and in the situation where the magnetic field is changing

Determine the strength of a current induced in a cicuit with a given resistance.
Determine the strength of a force on a wire loop given change in flux.

Determine the direction of an induced electric field given a changing magnetic field.