A variable resistance R is connected in series with a parallel combination of 5 ohms and 20 ohms. The entire circuit is connected to a 50V DC source. What is R if
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Two resistors, 20 ohms and 30 ohms, are connected in parallel. This combination is connected in a series to an 8 ohms resistor and a battery of e.m.f. 12 volts. What is