A spark plug in a car has electrodes separated by a gap of 0.023 in. To create a

Question

A spark plug in a car has electrodes separated by a gap of 0.023 in. To create a spark and ignite the air-fuel mixture in the engine, an electric field of 5.5 ? 106 V/m is required in the gap.

(a) What potential difference must be applied to the spark plug to initiate a spark?
-------------kV
(b) If the separation between electrodes is decreased, does the required potential difference increase, decrease, or stay the same?

increasesstays

the same

decreases

Explain.

(c) Find the potential difference for a separation of 0.081 in.
kV

Explanation / Answer

V = E*d = 5.5*0^6V/m * 0.023in*0.0254m/in =3213.1 V

increases

c) V = E*d = 5.5*10^6V/m * 0.0801in*0.0254m/in = 11189.97

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