Discussion
Assertion (A): Assertion: An enhancement-mode MOSFET can be self biased with a source resistor alone.
Reason (R): Reason: A source resistor makes the gate negative with respect to the source.
Select the correct answer from the options below.
Answer: C
The reason is true and is exactly why the assertion is false: an enhancement device needs the gate positive of the source, so the polarity self bias produces would keep it turned off. Self bias suits depletion devices only. A mechanism that is correct in itself can still be the wrong mechanism for the device at hand, and checking the required polarity first avoids the mistake.
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