An aired cored inductor is connected in series with a switch and d.c. source. The switch is closed and left for some time. Explain why a spark is observed across the switch contacts when the switch is reopened.

An aired cored inductor is connected in series with a switch and d.c. source. The switch is closed and left for some time. Explain why a spark is observed across the switch contacts when the switch is reopened. (03marks)

When the switch is opened,  the falling current causes a change in the magnetic flux linking the inductor coil.

A change in the magnetic flux linking the coil, induce a large e.m.f in the circuit and leads to high the electric field intensity between the contact points causing ionization of gases.

When the oppositely charged ions collide, a spark is produced.

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