1. A magnetising coil of 850 turns carries a current of 25 mA. Determine the resulting mmf.
2. It is required to produce an mmf of 1200 At from a 1500 turn coil. What will be the required current?
3. A current of 2.5 A when flowing through a coil produces an mmf of 675 At. Calculate the number of turns on the coil.