Discussion
The voltage (v) required to produce a spark across the gap between sparking points of a spark plug used in petrol engines is in the range of :
Answer: A
The voltage is in the range of 6000 v and above.
The air-fuel mixture in the gap between the spark plug electrodes is compressed and a good insulator, so a very high voltage is needed to ionise it and make a spark jump. The ignition coil steps up the 6 or 12 V of the battery to several thousand volts, typically well above 6000 V and up to around 20,000 V.
The other ranges, from 100 V to 5500 V, are too low to break down the compressed mixture in the plug gap, which is why the coil's step-up is needed.
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