Split ring commutator coil magnet 20 Ω 9.1 The coil rotates within the magnetic field. Write down the type of current (AC or DC): 9.1.1 Induced in the coil. 9.1.2 Passing through the 20 Q resistor. Give a reason for the answer. Carbon brush (1) (2) 9.2 An AC generator is used in the commercial production of electricity 9.2.1 State ONE fundamental difference in construction between an AC generator and a DC generator (2) 9.2.2 Fully explain why AC is preferred to DC for transmission of electricity over long distances. (3)​