Lay a current-carrying wire between two magnets and it jumps. Two magnetic fields, the wire and the magnets, overlap and the wire is shoved sideways. Harness that shove and you have a motor.
A wire carrying a current in a magnetic field experiences a force, the motor effect. The force is larger with a bigger current or a stronger field, and it reverses if the current or the field is reversed. The left-hand rule relates the directions of force, field and current.
When a current-carrying conductor lies in a magnetic field, it experiences a force. This is the motor effect.
Reversing the current or the field reverses the force. Fleming’s left-hand rule gives the directions of force, field and current.
Send current through the wire in the field and see which way the force pushes it.
Four quick checks. Each correct answer earns XP and lights this skill on your star map.
A current-carrying wire placed in a magnetic field experiences...
The force on the wire is increased by...
Reversing only the direction of the current...
In the left-hand rule, the first finger represents the...
The size depends on current and field strength; the direction follows the left-hand rule.
The force is greatest when the current is at right angles to the field, and zero when the current runs along the field. Reversing either the current or the field reverses the force, but reversing both leaves it unchanged.
Unlocks once the four checks above are done. Worth more XP, written in the style of Paper 2.
Both the current and the magnetic field are reversed at the same time. The force on the wire...
A current-carrying wire lies exactly along the direction of the magnetic field. The force on it is...
Which change would make the force on the conductor smaller?
The motor effect is mapped. Keep the chain going.