Physics 7.3.4

Question 1

What do ‘Microphones’ do?

Answer 1

Microphones Convert Sound Waves into Electrical Current.

Question 2

A Moving Coil Microphone Works Using the Principles of the…

Answer 2

Generator Effect.

Question 3

What Happens when Sound Waves Reach the Microphone?

Answer 3

When Sound Waves Reach the Microphone, the Pressure Variations Cause the Diaphragm to Vibrate.

Question 4

Explain how a Microphone Works: (4)

Answer 4

-When Sound Waves Reach the Microphone, the Pressure Variations Cause the Diaphragm to Vibrate.

-This in turn Causes the Coil inside the Microphone to Move Back & Forth constantly, Through the Magnetic Field Produced by the Magnet Inside the Microphone.

-As it Does so, the Current Flowing Through the Coil Cuts Through the Magnetic Field Lines of the Magnet Inside the Microphone. This Induces a Potential Difference in the Coil.

-The Potential Difference will be Alternating, because the Coil is Constantly Changing Direction, due to the Vibrations of the Diaphragm.