As compared to a bipolar transistor, a JFET is-

Sensitivity Comparison between Bipolar Transistor and JFET:

• A Junction Field-Effect Transistor (JFET) and a bipolar transistor are both types of transistors used for amplification and switching purposes, but they operate differently and have distinct characteristics.

Operation of Bipolar Transistor:

• A bipolar transistor operates based on the injection and collection of charge carriers (electrons and holes). It requires a base current to control a larger current flowing between the collector and emitter.
• The relationship between the input (base current) and output (collector current) is characterized by the transistor's current gain (β), which can vary widely.
• Bipolar transistors are sensitive to changes in input voltage, but their sensitivity is largely dependent on the current gain and other factors like temperature.

Operation of JFET:

• A JFET is a voltage-controlled device where the current flow between the drain and source is controlled by the voltage applied to the gate. It operates by creating an electric field that controls the conduction channel.
• The input (gate-source voltage) controls the output (drain current) without the need for significant gate current, as the gate current in a JFET is usually negligible.
• Because the JFET is a voltage-controlled device, small changes in the gate-source voltage can result in significant changes in the drain current, making it more sensitive to input voltage changes compared to a bipolar transistor.

Conclusion:

• As per the correct answer (Option 2), a JFET is more sensitive to changes in input voltage compared to a bipolar transistor. This is due to the voltage-controlled nature of the JFET, which allows for greater amplification and sensitivity to small changes in input voltage.