Shiny metal disc in electric power meter rotates due to which of the following?
Answer & explanation
Correct answer: option 4
The shiny metal disc in the electric power meter
(analogue type) rotates due to the eddy currents. Electric currents
are induced in the disc by magnetic fields produced by sinusoidally
varying currents in a coil.
You can observe the rotating shiny disc in the power meter of your
house.