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A battery of e.m.f 10 V and internal resistance 0.5W is connected across a variable resistance R. The value of R for which the power delivered in it is maximum is given by
(a) 0.5 ohm
(b) 1.0 ohm
(c) 2.0 ohm
(d) 0.25 ohm
(a)
The output power of a cell is given by
P = I2R
Maximum power is delivered to the load only when the internal resistance of the source is equal to the load resistance (R). Then
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