A battery has an electromotive force of 60 V and its internal resistance of 20 ohm its terminals are joined by a resistance wire the length of which is varied until the rate of heat production in the wire reaches a maximum value. When this happens, what is potential difference across the terminals of the battery?
a) 60 V
b) 40 V C) 30 V d) 20 V e) zero
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Answer:
(c) 30V is the answer of your question
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Answer:40 v
Explanation:
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