The input impedance of a JFET is high because _

Its gate is insulated from the channel

Its input is reverse biased

Of the presence of the substrate

All the above

JFET or Junction Field Effect Transistor is one of the simplest types of field-effect transistor.
JFETs are voltage-controlled devices.
In JFET, the current flow is due to the majority of charge carriers.
By applying a reverse bias voltage to a gate terminal, the channel is “pinched”, so that the electric current is impeded or switched off completely. Thus input impedance becomes high.

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