AQA GCSE Physics 4.7 Magnetism and electromagnetism overview quiz quiz

They attract

Nothing happens

They become demagnetised

They repel

A material that becomes magnetic only when in a magnetic field

A permanent magnet that always produces its own magnetic field around it

A magnet that has completely lost both of its poles and its magnetism

A magnet that is made only from copper, aluminium or another such metal

Copper

Iron

Aluminium

Gold

Straight parallel lines running along the wire

A uniform field shaped just like that of a bar magnet

Concentric circles around the wire

There is no magnetic field around the wire at all

Decreasing the current in the coil

Removing the iron core from the coil

Using fewer turns of wire on the coil

Adding more turns to the coil

The force on a current-carrying conductor in a magnetic field

The voltage that is induced in a wire when it moves through a magnetic field

The attraction or repulsion between the poles of two permanent magnets

The shape of the magnetic field that forms around a current-carrying solenoid

$0.5\,N$

$0.2\,N$

$2\,N$

$20\,N$

To increase the size of the current that flows through the coil of the motor

To switch the motor off automatically once the coil has reached full speed

To reverse the current every half turn so the coil keeps spinning one way

To create the magnetic field that the coil of the motor sits inside

A steady direct current flowing through the coil at all times

A constant, unchanging magnetic field with no movement of the coil or magnet

An iron core placed inside the coil and nothing else at all

A change in the magnetic field through the coil, or relative movement

It needs a changing magnetic field to induce a voltage in the secondary

Direct current is far too dangerous to use safely inside any transformer

Direct current simply cannot flow through the coils of wire in a transformer

Alternating current always has a much higher voltage than direct current does

Step-up, because the secondary coil has fewer turns than the primary

Step-down, because the secondary has fewer turns

Step-up, because the primary coil has more turns than the secondary

Neither; the voltage stays exactly the same on both sides

$2.5\,V$

$10\,V$

$40\,V$

$400\,V$