Microphones (ht Only) (GCSE Physics)

A dynamic microphone converts mechanical power from sound into electrical power. Which statement about energy conversion is correct?

Which measurement would directly indicate the sensitivity (volts per pascal) of a dynamic microphone?

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

A microphone’s output cable picks up a time-varying magnetic field from a nearby loudspeaker transformer, producing hum. Which engineering solution targets the problem most directly?

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

A microphone coil moves in a magnetic field and experiences a back emf when the circuit is closed. How does back emf affect the coil motion and microphone output?

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)?

A dynamic microphone’s coil moves more for low frequencies than for high frequencies with the same sound pressure. Which statement about the microphone’s frequency response is correct?

A moving-coil microphone is placed near the pole face of the magnet with the coil axis perpendicular to the field. For maximum induced emf the coil should:

In a studio, two moving-coil microphones capture the same source and are summed. If one microphone has a much higher self-noise level, what is the effect on the combined signal-to-noise ratio (SNR)?