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When the current through a large inductor is interrupted with a switch, an arc appears across the open terminals of the switc

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Answer #1

As current is flowing in the inductor, there would be the magnetic field. As the current supply is broken, the magnetic field will be collapsing in the inductor. This collapsing magnetic field (magnetic field changing with time) will generate a back EMF (an electromagnetic force in opposite direction of current flow). This induced EMF will generate or induces current in the inductor. And circuit is broken, this energy is released as an arc at the terminals of open switch.

So, arc appears due to the induced back current.

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