JEE PHYSICS MCQ: SEMI CONDUCTOR DEVICES

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The positive feedback is required by an amplifier to act an oscillator. The feedback here means:

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Correct option: B

A portion of the output power is returned back to the input

Option B (A portion of the output power is returned back to the input) is correct because positive feedback in an amplifier, which is necessary for it to act as an oscillator, involves feeding a portion of the output signal back to the input.

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A PN-junction has a thickness of the order of In a

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\mathrm{\alpha\; and\; \beta }

of a transistor