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

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

What is the physical effect that makes the voice-coil (moving-coil) loudspeaker cone move when an audio electrical signal is applied to the coil?

If a speaker cone must reproduce very high frequencies accurately, what design property of the cone is most important?

The SI unit of magnetic flux density (B) is the tesla. Which combination of SI units is equivalent to 1 tesla?

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

When a loudspeaker is driven by an alternating current, what is the main cause of the audible sound produced in the air?

A short audio pulse drives a straight section of voice-coil wire of length 0.65 m with a current of 0.020 A in a magnetic field of 0.125 T. Using F = BIL, what is the magnitude of the force on that wire?

What design reason explains using a soft-iron pole piece and laminated magnetic structure around the loudspeaker gap (instead of a solid thick metal block)?

Which factor will increase the magnitude of induced emf in a coil when it moves in a magnetic field?

If the RMS voltage applied to a speaker doubles and the speaker impedance stays the same, how does the RMS current change?

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