Multiple choice

On which principle does the tape recorder function?

  1. Electromagnetic induction

  2. Electrovalency

  3. Boyle's law

  4. None of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Tape recorders work on electromagnetic induction. The recording head converts electrical audio signals into varying magnetic fields that magnetize the tape coating. Playback reverses this process.