The shiny metal disk in the electric power meter (along type) rotates due to

The shiny metal disk in the electric power meter (along type) rotates due to
  1. temperature change
  2. eddy currents
  3. an external motor
  4. pressure change

Solution

The shinny metal disc in the electric power meter rotates due to eddy currents. The magnetic field induces the electric current in the disc.

Asked in: AP EAMCET 2023 (19 May Shift 1)

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