1.

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 \[R=0.5\]ohm by passing a current through it. The maximum Joulean power that can be developed across R using these batteries is             [CBSE PMT 1990; BHU 1997]

A.            1.28 watt                               
B.            2.0 watt
C.            \[\frac{8}{9}\,watt\]         
D.            3.2 watt
Answer» C.            \[\frac{8}{9}\,watt\]         


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