The voltage required to produce a spark across the gap, between the sparking points is

Step 1: In an internal combustion engine, the spark plug is used to ignite the compressed air-fuel mixture inside the cylinder.

Step 2: To produce a spark, a sufficiently high voltage is required to ionize the gap between the two electrodes of the spark plug.

Step 3: The voltage required depends on factors like gap distance, pressure inside the cylinder, and fuel mixture composition.

Step 4: Generally, the required voltage lies in the range of 6,000 to 10,000 volts under normal engine operating conditions.

Final Answer: The voltage required to produce a spark across the gap is 6,000 to 10,000 volts.