Fleming's Left-Hand Rule

What is Fleming's left-hand rule used for?

To determine the direction of force on a current-carrying conductor in a magnetic field.

Which hand is used for Fleming's motor rule?

The left hand.

What does the thumb represent in Fleming's left-hand rule?

The direction of force or motion.

What does the first finger represent in Fleming's left-hand rule?

The direction of the magnetic field, from north to south.

What does the second finger represent in Fleming's left-hand rule?

The direction of conventional current, from positive to negative.

How should the thumb and fingers be positioned?

At right angles to one another.

Why is conventional current used rather than electron flow?

Fleming's rule is defined using conventional current direction.

What happens to the force direction if current is reversed?

The force reverses.

What happens to the force direction if the magnetic field is reversed?

The force reverses.

Why must both current and field direction be known?

Together they determine the direction of the motor-effect force.

What is a common mistake when using Fleming's left-hand rule?

Confusing the first finger (field) with the second finger (current).

Does Fleming's left-hand rule determine the size of the force?

No, it determines the direction of the force.

What is the difference between the motor effect and generator effect?

The motor effect produces force from current in a magnetic field, whereas the generator effect produces induced potential difference from changing magnetic conditions.