Microphones (ht Only) (GCSE Physics)

A moving-coil microphone and a loudspeaker can be compared: which statement correctly contrasts their typical electromagnetic roles?

A moving-coil microphone has a coil of many turns attached to the diaphragm. Which change would increase the amplitude of the voltage produced for a given sound pressure?

A moving-coil microphone’s output leads must be connected to the preamplifier with correct polarity. If one mic sounds thin when added in parallel with another and cancels at some frequencies, what is the likely cause?

A moving-coil microphone shows nonlinearity at very high sound pressure levels. Which physical cause is most likely?

A moving-coil microphone is tested with a signal generator driving a small mechanical shaker that produces uniform diaphragm velocity across a range. The measured induced emf is linear with diaphragm velocity but drops at low frequencies. What is the most likely explanation for the low-frequency drop?

Which hand rule is used to predict the direction of the induced current when a conductor moves through a magnetic field (generator action)?

Which practical modification would increase a dynamic microphone’s maximum SPL handling (reduce distortion at very loud levels)?

Which statement about shielding and magnetic interference for dynamic microphones is correct?

Which property of a moving-coil microphone most affects its transient (attack) response to sharp sounds?

A moving-coil microphone is used in a windy outdoor location. Which technique best reduces wind-induced low-frequency noise while preserving speech intelligibility?

Lenz’s law gives the sign in Faraday’s law. What physical statement best describes Lenz’s law?