Physics · Electromagnetism and Instruments
How is the deflecting torque produced in a Permanent Magnet Moving Coil (PMMC) instrument?
- 1By electrostatic force between oppositely charged parallel plates
- 2By thermal expansion of a bimetallic strip heated by current
- 3By the reaction of induced eddy currents in a conductor disk
- 4By the interaction between the magnetic field of a permanent magnet and a current-carrying moving coil✓
Correct answer
By the interaction between the magnetic field of a permanent magnet and a current-carrying moving coil
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