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Two identical batteries each of e.m.f 2V and internal resistance 1 W are available to produce heat in an external resistance by passing a current through it. The maximum power that can be developed across R using these batteries is (a) 3.2 W (b) 2.0 W (c) 1.28 W (d) 8/9 W



Two identical batteries each of e.m.f 2V and internal resistance 1W are available to produce heat in an external resistance by passing a current through it. The maximum power that can be developed across R using these batteries is


        (a)    3.2 W


        (b)    2.0 W


(c)    1.28 W


(d)    8/9 W


Grade:11

1 Answers

Hrishant Goswami
343 Points
7 years ago

(b)

For maximum current, the two batteries should be connected in series. The current will be maximum when external resistance is equal to the total internal resistance of cells i.e. 2W. Hence power developed across the resistance R will be

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