The Motor Effect

What is the motor effect?

• The idea that a current-carrying wire produces its own magnetic field.

• The idea that a current-carrying wire in the presence of a magnetic field will experience a force.

• The interaction between two magnetic fields.

• The process of converting mechanical energy into electrical energy.

For a current-carrying wire in a magnetic field, when does it experience the maximum force?

• When the wire is parallel to the magnetic field lines.

• When the wire is at a slight angle to the magnetic field lines.

• When the wire is perpendicular (90 degrees) to the magnetic field lines.

• When there is no current flowing through the wire.

Using Fleming's Left-Hand Rule, if the magnetic field points downwards (North to South) and the current flows towards you, what is the direction of the force on the movable rail?

• To the left

• To the right

• Upwards

• Downwards

A 10 cm wire carrying a 5 A current is placed at a right angle in a magnetic field with a flux density of 0.4 T. What is the magnitude of the force experienced by the wire?

• 0.02 N

• 0.2 N

• 2.0 N

• 20 N