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Why closed path is required for the flow...

Why closed path is required for the flow of current?

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Closed path is required for the flow of current because if the path is not closed, the circuit will break which will mean that between the two ends air is present. Since we know that air is an insulator, it will not allow the flow of charges through it and the current will not flow.
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ZEN PUBLICATION-ELECTRICITY-ZEN ADDITIONAL QUESTIONS SECTION (SHORT ANSWER TYPE 1 QUESTIONS)
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  10. Define the term electric power. Write an expression for it.

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