Question:

In n- p-n transistor, the collector current is 10 mA. If 90% of the electrons emitted reach the collector, then

Updated On: Mar 4, 2024
  • emitter current will be 9 mA
  • emitter current will be 11.1 mA
  • base current will be 0.1 mA,
  • base current will be 0.01 mA
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The Correct Option is B

Solution and Explanation

Collector current IC=10 mAI_C =10 \,mA
Given, IC=90100IE I_C =\frac{90}{100}I_E
∴IE=10090×10\therefore I_E =\frac{100}{90} \times 10
=1009mA =\frac{100}{9} mA
Also, IB=IE−IC=11.1 mA=11.1−10=1.1 mAI_B=I_E -I_C =11.1 \,mA =11.1 -10 =1.1\, mA
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Concepts Used:

Semiconductors

Semiconductors are a crystalline solid materials, whose electrical conductivity lies between a conductor and an insulator. Semiconductors are mainly used in the manufacturing of electronic devices like capacitors, transistors, diodes, Integrated circuits, etc.

Properties of Semiconductor:

  1. Semiconductor acts like an insulator at Zero Kelvin. On increasing the temperature, it works as a conductor.
  2. Due to their exceptional electrical properties, semiconductors can be modified by doping to make semiconductor devices suitable for energy conversion, switches, and amplifiers.
  3. Lesser power losses.

Uses of Semiconductor:

  1. Semiconductors are widely used in manufacturing electronics devices like transistors, diodes, sensors, integrated circuits.
  2. Semiconductors are widely used in all electronic devices, like mobile phones, digital cameras, communication devices, trains, ATMs, etc.