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Physical electronics devices and ics miscellaneous

Physical Electronics Devices and ICs

  1. If the transistors in figure have high values of β and a VBE of 0.65V, the current I flowing through the 2 kΩ resistance will be—


    1. 1 mA
    2. 3.33 mA
    3. 0
    4. 5 mA
Correct Option: A

For DC current
IE2 ≈ IE1
or IC2 ≈ IC1
Neglecting IB1 which will be very small, β being very high, the base voltage of Q1 is

VB1 =
VCC
(by using potential divider method)
(1.65 kΩ) 6.5 kΩ + 1.85 kΩ + 1.65 kΩ

= 10 ×
1.65
= 1.65 V IE1
10

=
VB1 – VBE
=
= (1.65 – .65) V
mA.
1 kΩ1 kΩ


The current flowing through the 2 kΩ resistor is 1 mA.
Since IC2 ≈ IC1.
Hecne alternative (A) is the correct answer.



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