On the basis of the graphs shown in the figure, answer the following question: (a) Which physical parameter is kept constant for the three curves?

(a) On the basis of the graph shown in the figure:
From the graph, All the three voltages have same saturation current i.e. 'T'
(b) From the given diagram;
We have v3 > v2 > v
∴ v3 has maximum frequency