I-V characteristics of four devices are shown in the figure.
Identify devices that can be used for modulation:
(a) ‘i’ and ‘iii’
(b) only ‘iii’
(c) ‘ii’ and some regions of ‘iv’
(d) All the devices can be used.
From the above-given figures, option ii) represents the square-law diode modulation and the option iv) represents some of its parts as the square law modulation there for the correct option is (c) ‘ii’ and some regions of ‘iv’