An electric bulb only glows when the circuit is closed.

Current flows through the circuit

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Electric circuit is incomplete

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Solution

The correct option is A
Current flows through the circuit

Electric current can only flow when there is a closed path. The flow of electrons through the filament of a bulb generates heat and light. Hence, an electric bulb glows only when the circuit is closed.

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An electric bulb will glow only when the circuit ______.

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