Question

Producing an electric spark in a factory furnace requires an electric field of 9.5 × 106 V/m. The

gap between electrodes in the ignition device is 8.5 mm. What minimum potential difference

must be supplied by the ignition device to start the furnace?

Answer 1

The minimum potential difference must be supplied by the ignition device to start the furnace is

$U = E \times d = 9.5 \times 10^6 \times 8.5 \times 10^{-3} = 80.75 \times 10^3 \;V = 80.75\; kV$

Answer: 80.75 kV