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

Options

A. 1.28 watt
B. 2.0 watt
C. `8//9` watt
D. 3.2 watt

Answer

B

Explanation

For max power `P("max") = n(E^(2)/(4r)) =2((2 xx 2)/1) = 2` watt