Two identical batteries, each of e.m.f. 2 volt and internal resistance 1.0 ohm 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
1.28 watt
B
2.0 watt
C
D
3.2 watt
Text Solution
Verified by ExpertsThe correct answer is:
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. 
. Hence power developed across the resistance R will be
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