Microphones (ht Only) (GCSE Physics)

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

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

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?

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 Faraday’s law emf = -N dF/dt, if a microphone’s coil has N turns and the diaphragm causes the flux through each turn to change sinusoidally with time at fixed amplitude, how does induced emf scale with N?

Why might a microphone’s output be inverted (180° phase shift) compared with a loudspeaker input, and why does phase matter in multi-mic setups?

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

Which property of the magnet in a moving-coil microphone most directly affects the sensitivity (voltage per unit diaphragm displacement)?

Why is Lenz’s law important to understand when designing a microphone’s suspension and restoring forces?

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

In a microphone, why is it important that the coil moves freely with minimal mechanical damping (apart from intended electrical damping)?