Magnetism

Question 1

Magnetic field lines move from

Answer 1

North to south

Question 2

How do loudspeakers work

Answer 2

Change in current causes change In magnetic field
Magnet repeatedly attracts and repels the electromagnet
Speakers vibrate
Sound is created

Question 3

Microphones

Answer 3

Sound waves hit the microphone make a coil inside the magnet vibrate
It vibrates at the same frequency as the sound wave coming in
Induces a potential difference and current in the coil

Question 4

Transformers

Answer 4

Primary coil
Secondary coil
Iron core

Question 5

Step up transformers

Answer 5

The number of coils in the secondary coil has more turns than the primary coil
Potential difference in secondary coil is greater

Question 6

Step down transformers

Answer 6

The secondary coil had fewer turns than
The potential difference is less