\(8\,V\) જેટલા અચળ કલેકટર-એમીટર વોલ્ટેજ માટે ટ્રાન્ઝિસ્ટરમાં ત્યારે બેઝ પ્રવાહ \(20 \;\mu A\) થી \(25\;\mu A\) બદલાય છે ત્યારે કલેક્ટર પ્રવાહ \(4\,mA\) થી \(6\,mA\) થાય છે. જે ટ્રાન્ઝિસ્ટર એક્ટિવ સ્થિતિમાં હોય તો નાના સિગ્નલ માટે પ્રવાહ લબ્ધિ \(...............\) હશે.

A \(240\)
B \(400\)
C \(0.0025\)
D \(200\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(400\)

Step-by-step Solution

Detailed explanation

\(3\,V_{C E}=8\,V = I _{ C }=6\,mA\) from \(4\,mA\) \(I _{ B }=20\, \mu A\) to \(25\, \mu A\) Current gain \(\beta_{ av }=\frac{ I _{ C }{ }^{\prime}- I _{ C }}{ I _{ B }{ }^{\prime}- I _{ B }}=\frac{2\, mA }{5\, \mu A }\)…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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