ME6 - The motor effect Flashcards Preview

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Flashcards in ME6 - The motor effect Deck (13):

How does a motor effect happen?

When you put a current carrying wire in a magnetic field (causes the wire to move)


Why does the wire move?

It is because charged particles moving through a magnetic field will experience a force as long as they're not moving parallel to the field lines


To experience a full force what does the wire have to be at?

90 degrees to the magnetic field (wont work if the wire runs along the magnetic field)


What direction does the force always act towards?

The same direction relative to the magnetic field of the magnets and the direction of the current in the wire (north-south poles)


The direction of the force depends on what?

- The direction of the magnetic field
- Direction of the current


What is a good way showing the direction of a force?

Apply a current to a set of rails inside a horseshoe magnet. A bar is placed on the rails which completes the circuit - this generates a force that rolls the bar along the rails


What does the magnitude of the force increase?

Th strength of the magnetic field


How else does the force increase?

The amount of current flowing through the conductor


What happens if you reverse the current or magnetic field?

It also reverse the direction of the magnetic field


What does flemings left hand rule tell you?

Which way the force acts


What do the thumb, first finger and second finger represent?

Thumb - Motion (force)
First finger - Field
Second finger - Current


How do you use flemings left hand rule?

Using your left hand point your first finger in the direction of the field and your second finger in the direction of the current. Your thumb will then point in the direction of the force (motion)


A thin strip of aluminium foil held between the poles of a strong magnet

When the switch is closed the aluminium foil moves. Explain way

The magnetic field due to the current in the foil interacts with the permanent magnetic field of magnet, causing a force on the foil so, the foil moves.