A 3-phase moving coil type power factor meter has three fixed and symmetrically spaced current coils, inside of which are three other similarly placed moving potential coils. While in operation, rotating magnetic field is produced

• A. in the current coils but not in the potential coils
• B. in the potential coils but not in the current coils
• C. in both potential coil and the current coils
• D. in neither the potential coils nor the current coils