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Q.

In a silicon transistor, the base current is changed by 20 $μ$ A. This results in a change of 0.02 V in base to emitter voltage and a change of 2 mA in the collector current. The transistor is used as an amplifier with the load resistance of 5 k $Ω$ . The change in output voltage across load is

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a

100 v

b

10 V

c

20 V

d

5 V

answer is B.

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Detailed Solution

Input resistance $R_{in} = \frac{0 .02}{20 \times 10^{- 6}} = \frac{2 \times 10^{4}}{20} Ω = 10^{3} Ω$

Change in output across load = 5000 x 0.002 V = 10 V

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In a silicon transistor, the base current is changed by 20 μA. This results in a change of 0.02 V in base to emitter voltage and a change of 2 mA in the collector current. The transistor is used as an amplifier with the load resistance of 5 kΩ. The change in output voltage across load is