Analog Electronics
The action of JFET in its equivalent circuit can best be represented as a

Current controlled Current source
Current controlled voltage source
voltage controlled current source
Voltage controlled voltage source

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Analog Electronics
Voltage Series (feedback also called series-shunt feedback) results in

Increase in both input & output impedances
Decrease in input impedance & increase in output impedance
Increase in input impedance & decreases in output impedance
Decreases in both input & output impedances

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