4.1.1 magnets and magnetic fields

Question 1

How do like poles and unlike poles interact?

Answer 1

Like poles repel and unlike poles attract

Question 2

How do use the force from a magnet and a current carrying conductor to make an electric motor rotate?

Answer 2

You need a split ring commutator and this will allow current to flow from the battery but change to different halves of the coil as it spins.

Question 3

How is electromagnetic induction used to produce AC

Answer 3

By using an alternator as the rotation continues in a wire and that side of the coil moves down, the induced potential difference reverses direction. This means that the alternator produces a current that is constantly changing

Question 4

How is electromagnetic production used to produce dc

Answer 4

A dynamo allows a current to be driven that doesn’t change direction

Question 5

how does a microphone work?

Answer 5

A sound wave hits the diaphragm of the microphone, compressions push the diaphragm in and rarefactions pull it out which produces an electrical signal from the microphone.

Question 6

How does a loudspeaker work?

Answer 6

The changing potential difference produces a current and that current produces a force on a coil of wire and the cone doesn’t spin but it moves in and out which produces a sound wave.