Increasing the reverse bias voltage applied to a JFET gate causes the width of the conducting channel to ______________?
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Answer: A. is decreased
Explanation
Increasing the reverse bias voltage applied to the gate widens the depletion region. This expanding depletion layer encroaches further into the conductive semiconductor channel region. Consequently, the physical cross-sectional area and width of the conducting channel are decreased. Junction field-effect transistors operate by varying the width of an internal conductive channel. Depletion regions form at pn junctions when mobile charge carriers are swept away by electric fields. Controlling channel width allows the gate voltage to regulate drain current flow through the device.
This depletion mechanism enables the field-effect transistor to function as a voltage-controlled resistor. Circuit designers utilize this variable resistance property for automatic gain control and switching tasks. Understanding channel constriction is fundamental for analyzing field-effect transistor operating principles. Option B is incorrect because increasing reverse bias widens depletion layers and narrows the channel. Option C is incorrect because channel width changes dynamically in response to applied gate voltages. Option D is incorrect since option A accurately describes the physical reduction in channel width.
- Subject
- Engineering
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- Electrical Engineering
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- —
- Difficulty
- medium
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