Discussion
Assertion (A): Assertion: A MOSFET output stage needs emitter ballast resistors.
Reason (R): Reason: Devices in parallel must share current between them.
Select the correct answer from the options below.
Answer: A
The reason states a real requirement but the assertion is false for MOSFETs: their on-resistance rises with temperature, so a hot device sheds current to its cooler partners and the sharing corrects itself. Bipolar devices need the ballast because their forward drop falls as they heat, giving positive feedback instead. A requirement that holds for one device family and not another is worth attaching to the mechanism rather than to the arrangement.
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