The gap between electrodes in a spark plug is 0.06 cm. In order to produce an electric spark in?

Question

The gap between electrodes in a spark plug is 0.06 cm. In order to produce an electric spark in a gasoline-air mixture, the electric field must reach a value of 3 ´ 106 V/m. What minimum voltage must be supplied by the ignition circuit when starting the car?

Answer 1

3 x 10^6 V/m x 0.06 x 10^-2 m = 1800 V