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The cut-off frequency of a JFET is that time when the magnitude of the input current is ___________

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The cut-off frequency of a JFET is that time when the magnitude of the input current is ___________

(a) Greater than the output current

(b) Less than the output current

(c) Equal to the output current

(d) Twice the output current

I have been asked this question by my college professor while I was bunking the class.

The doubt is from Characteristics of JFET topic in section FET Amplifiers of Analog Circuits

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Correct option is (c) Equal to the output current

For explanation I would say: The cut-off frequency is an important feature of the JFET due to the present of capacitive effects. It has been seen that the output current becomes a function of frequency in high-frequency applications and hence we have to choose a cut-off frequency so that the output current is equal to the input current.

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