Assertion: A spark occur between the poles of a switch when the switch is opened.
Reason: current flowing in the conductor produces magnetic field.

Options

A. If both asseration and reason are true and reason is the correct explanation of assertion.
B. If both asseration and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer

B

Explanation

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 bridge the air gap between the poles of the switch.(the spark is more likely in circuit with large inductance).