Current Electricity and Electrical InstrumentHard

Question

Three equal resistance each of R ohm are connected as shown in figure. A battery of 2 volts of internal resistance 0.1 ohm is connected across the circuit. Calculate the value of R for which the heat generated in the exeternal circuit is maximum.                   

Options

A.0.1 Ω
B.0.2 Ω
C.0.3 Ω
D.0.4 Ω

Solution

For Pmax     ⇒    r = Req ,    Req = R/3
0.1 = R/3     ⇒    R = 0.3 Ω

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