Loudspeakers (physics Only) (ht Only) (GCSE Physics)

A loudspeaker is rated for a certain RMS (effective) input power. If the RMS voltage applied to the speaker doubles and the impedance remains approximately constant, what happens to the RMS electrical power delivered to the speaker?

A crossover network uses an inductor in series with a loudspeaker driver. What is the inductor’s principal effect on the audio signal?

Which of the following is the correct definition of an induced magnet?

In a loudspeaker the “motor effect” is the name commonly given to which phenomenon?

Why does the impedance (effective opposition to AC current) of a typical loudspeaker voice coil tend to increase at higher audio frequencies?

Which equation gives the magnitude of the magnetic force on a straight conductor of length L carrying current I at right angles to a magnetic flux density B?

In a loudspeaker, if you increase the number of turns of the voice coil (keeping current the same), what is the effect on force for a coil occupying the same magnetic gap?

What is the main purpose of the permanent magnet in a moving-coil loudspeaker?

When voice-coil current is suddenly interrupted while the coil is moving in the magnet gap, an emf is induced across the coil which opposes the change. What practical effect does that induced emf have on coil motion?

In a moving-coil loudspeaker the magnetic field between the permanent magnet poles is directed from which pole to which pole?

Which of the following describes why a tweeter is often mounted on a small stiff dome rather than a large paper cone?