A spark plug in a car has electrodes separated by a gap of 0.019 in. To create a

Question

A spark plug in a car has electrodes separated by a gap of 0.019 in. To create a spark and ignite the air-fuel mixture in the engine, an electric field of 5.2 106 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 increased, does the required potential difference increase, decrease, or stay the same?
stays the same
increases
decreases


Explain.

This answer has not been graded yet.

(c) Find the potential difference for a separation of 0.057 in.
kV

Explanation / Answer

V=E*d=5.2E6*0.019*0.0254=2509.52 V or 2.51 kV

increase

5.2E6*0.057*0.0254=7528.56 V or 7.52 kV

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