When two identical batteries of internal resistance 1 each (having polarity in same direction) are connected in series across a resistor r, the rate of heat produced in r is p1. When the same batteries(having polarity in same direction) are connected in parallel across r, the rate is p2. If p1 = 2.25 p2 then find the value of r in ohm?
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i dont know the exact answer......
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It's 4Ω
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