Explain why a spark is seen at the switch when the circuit of a current carrying coil is broken

Explain why a spark is seen at the switch when the circuit of a current carrying coil is broken.

When the switch is broken, the magnetic flux linking the coil collapses. A large e.m.f is induced between the contacts creating a high electric field intensity which ionizes the air there. The ions meet and neutralize violently producing sparks.

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