Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET 2012
Exam
NEET
Year
2012
Subject
Physics
Chapter
Semiconductors

NEET 2012 · Physics · Semiconductors

In a CE transistor amplifier, the audio signal voltage across the...

In a CE transistor amplifier, the audio signal voltage across the collector resistance of 2kΩ2 \mathrm{k} \Omega is 2 V2 \mathrm{~V}. If the base resistance is 1kΩ1 \mathrm{k} \Omega and the current amplification of the transistor is 100 , the input signal voltage is

Options

  1. A0.1 V0.1 \mathrm{~V}
  2. B1.0 V1.0 \mathrm{~V}
  3. C1mV1 \mathrm{mV}
  4. D10mV10 \mathrm{mV}

Correct answer

D. 10mV10 \mathrm{mV}

Step-by-step solution

Current amplification factor β=ΔICΔIB\beta=\frac{\Delta I_C}{\Delta I_B} Collector resistance ΔIC=2 V2×103Ω=1×10−3 A\Delta I_C=\frac{2 \mathrm{~V}}{2 \times 10^3 \Omega}=1 \times 10^{-3} \mathrm{~A} Base current ΔIB=VBRB=VB1×103=VB×10−3\Delta I_B=\frac{V_B}{R_B}=\frac{V_B}{1 \times 10^3}=V_B \times 10^{-3} Given, β=100\beta=100 Now, 100=10−3VB×10−3100=\frac{10^{-3}}{V_B \times 10^{-3}} VB=1100 V=10mVV_B=\frac{1}{100} \mathrm{~V}=10 \mathrm{mV}
Practice Semiconductors on Quantrex Academy →

More from Semiconductors

For two inputs A and B and output Y, the Boolean expression for NOR gate is MHT CET Medical 2026For an n-type semiconductor, the relation between the number density ' n_h ' and ' n_e '… MHT CET Medical 2026A silicon crystal is doped with 5 × 10^ 17 \ cm^ -3 atoms of boron. The electron… MHT CET Medical 2026If the current gain in common-base configuration (α ) of a transistor increases from 0.95… MHT CET Medical 2026Out of the following what is used to detect the intensity of light ? MHT CET Medical 2026The color of light emitted by an LED is determined primarily by which of the following… MHT CET Medical 2026Which of the following is true for a p-type semiconductor? MHT CET Medical 2026In case of semiconductors, the band gap between the valence band and conduction band is MHT CET Medical 2026 Full Semiconductors list All NEET PYQs