A)
B)
C)
D) Both (a) and (b) are correct
Correct Answer: D
Solution :
Terminal voltage \[V=E-Ir.\] Hence the graph between V and i will be a straight line having negative slope and positive intercept. Thermal power generated in the external circuit \[P=EI-{{I}^{2}}r.\] Hence graph between P and I will be a parabola passing through origin. Also at an instant, thermal power generated in the cell = \[{{i}^{2}}r\] and total electrical power generated in the cell = Ei. Hence the fraction \[\eta =\frac{{{I}^{2}}r}{EI}=\left( \frac{r}{E} \right)\,I;\] so \[\eta \propto I\]. It means graph between h and I will be a straight line passing through origin.
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