A student places a straight wire between the poles of a magnet. The wire is at right angles to the magnetic field.
The direction of the force on the wire can be found using a rule that uses the thumb and the first two fingers of one hand.
The Table shows the three fingers used in this rule.
Table
| Finger | What the finger represents |
|---|---|
| thumb | |
| first finger | |
| second finger |
State what happens to the wire when there is a current in it.
Name the rule that is used to find the direction of the force on the wire.
Complete the Table to show what each finger represents in this rule.
Give the unit of magnetic flux density.