railway RRB JE (CBT I + CBT II) Mock Test 2024 Electrical and Electronics Measurements Measurement of Power Measurement of Poly Phase Power
Which of the following concepts is applied in instruments of the electrodynamometer type?
1
Magnitude effect
2
The force between a permanent magnet and a current carrying coil
3
The force between two permanent magnets
4
The force between two current carrying coils