The emf of a source is equal to the potential difference across the terminals of the source when either its internal resistance is __________. (Zero, Infinite, Zero or infinite, None of these)

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When the internal resistance is zero. If otherwise, the voltage across the terminals of the source suffers a loss across the internal resistance of the emf source.
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The emf of a source is equal to the potential difference across the terminals of the source when its internal resistance is _Zero,
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