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29-05-2023
Physics

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a rheostat and an ammeter are connected in series to a battery if of 0.2-ohm internal resistance. when the rheostat is adjusted to 10 ohms, the ammeter reads 5 amperes. The ammeter reading drops to 3 amperes, when the rheostat is adjusted to 18 ohms. what is the emf of the battery?

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