4.5.3-4.5.5 · Magnetic effect of a current, forces and the d.c. motorLesson 4 of 11
Loudspeakers
A changing current in a coil next to a magnet pushes a cone in and out, and the cone makes sound.
Locked
Unlock the rest of O Level Physics: Electricity and Magnetism (5054).
- Every lesson, every resource, unlocked instantly.
- Track progress and pick up where you left off.
- Free preview lessons stay readable from the outline.