Which device does NOT make use of the magnetic effects of an electric current?

Which device does NOT make use of the magnetic effects of an electric current?
  • A.
    hot-wire ammeter
  • B.
    moving-coil ammeter
  • C.
    moving-coil loudspeaker
  • D.
    moving-iron ammeter
  • E.
    telephone earpiece
Correct Answer: Option A
Explanation
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