MHT CET 2025 Physics question

Not in JEE Advanced syllabus

In an n-p-n transistor amplifier, the collector current is 8 mA. If 80% of the electrons from the emitter reach the collector, then ( and are current ratios)

(A)the base current is 20 mA
(B)the emitter current is 2 mA
(C) = 0.8, = 4.0Correct
(D) = 4.0, = 0.8

Answer: (C)

Solution

The fraction of emitter current reaching the collector is the current gain . So mA and the base current is mA. Then (also

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Question ID VK-101869