The following statements about a loudspeaker are correct except?
A
its contains a permanent magnet.
B
sound signal converted to varying current signal enters the speech coil.
C
the current in the speech coil creates a magnetic force on the coil.
D
the magnetic force on the speech coil is uni-directional.
Verified Correct Answer: D.
Physical Principles & Numerical Solution
The magnetic force on the voice coil is bi-directional, allowing it to move back and forth, producing sound waves.
Source: Myschool Past Questions Archive (Record #62306)