Magnetism and the motor effect

A magnet can be used to sort aluminium cans from steel cans. Explain how this works

• The magnet will attract the steel cans only because steel is a magnetic material (aluminium is not magnetic)

• The magnet will repeal the steel cans only because steel is a magnetic material (aluminium is not magnetic)

• The magnet will have no effect on the steel cans only because steel is a magnetic material (aluminium is not magnetic)

What is an induced magnet

• When a magnetic material is placed in a magnetic field and becomes a magnet itself

• When a non magnetic material is placed in a magnetic field and becomes a magnet itself

• When a magnetic material is placed in a magnetic field and becomes demagnatised

What is a uniform magnetic field?

• Has the same strength and direction (everywhere)

• Has different strength and direction (everywhere)

• Has the same strength and different direction (everywhere)

State what is meant by a solenoid.

• A coil of wire with a current flowing through it.

• A coil of wire with a magnet attached to it

Explain where the magnetic field is strongest in a solenoid

• Outside because the fields (from individual coils) go against each other

• Inside the coil because the fields (from individual coils) reinforce each other

What is the advantage of an electromagnet versus a permanent magnet.

• The electromagnet are light weight

• The electromagnet can't be switched on or off

• The electromagnet can be switched on or off

In the right hand rule, what do the fingers and thumb represent?

• Thumb= the direction (of the magnetic field)

  Finger = the direction of current

• Thumb= the direction (of the magnetic field)

  Finger = the direction of voltage

• Fingers = the direction (of the magnetic field)

  Thumb = the direction of current

Describe two ways in which the magnetic field around a wire can be changed

• Decrease current (increases strength), change the direction of current (changes the magnetic field direction)

• Increase current (increases strength), change the direction of current (changes the magnetic field direction)

• Current stays the same but change the direction of current (changes the magnetic field direction)

What is the motor effect

• A force experienced by a wire carrying a electron in a magnetic field

• A energy feild experienced by a wire carrying a current in a magnetic field

• A force experienced by a wire carrying a current in a magnetic field

In Flemings left hand rule what do the thumb, index and middle finger show?

• Thumb = direction of force

  Index = direction of magnetic field

  Middle = Direction of current

• Index = direction of force

  Thumb = direction of magnetic field

  Middle = Direction of current

• Thumb = direction of force

  Middle = direction of magnetic field

  Index = Direction of current