This question has Statement I and Statement II. Of the four choices given after the Statements, choose the one that best describes the two statements.
Statement-1: A spark occur between the poles of a switch when the switch is opened.
Statement-2: Current flowing in the conductor produces magnetic field.

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Both Statement-1 and 2 are true and Statement-2 is the correct explanation of Statement-1.

Both Statement-1 and 2 are true but Statement-2 is not the correct explanation of Statement-1.

Statement-1 is true but Statement-2 is false.

Statement-1 is false but Statement-2 is true.

answer is B.

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Detailed Solution

According to Lenz’s law, induced emf are in a direction such as to attempt to maintain the original magnetic flux when a change occurs. When the switch is opened, the sudden drop in the magnetic field in the circuit induces an emf in a direction that attempts to keep the original current flowing. This can cause a spark as the current bridges the air gap between the poles of the switch. (The spark is more likely in circuits with large inductance).

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