Question:
The current gain of a common emitter amplifier is $69$ . If the emitter current is $7.0 \,mA$, collector current is :
The current gain of a common emitter amplifier is $69$ . If the emitter current is $7.0 \,mA$, collector current is :
Updated On: Apr 28, 2025
- 9.6 mA
- 6.9 mA
- 0.69 mA
- 69 mA
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The Correct Option is B
Solution and Explanation
$\beta=69=\frac{I_{C}}{I_{B}}$
$\alpha=\frac{\beta}{1+\beta}=\frac{69}{70}=\frac{I_{C}}{I_{E}}$
$I_{C}=I_{E}\times\frac{69}{70}$
$=\frac{69}{70}\times7$
$=6.9$ mA
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Concepts Used:
P-n Junction
A P-N junction is an interface or a boundary between two semiconductor material types, namely the p-type and the n-type, inside a semiconductor.
Biasing conditions for the p-n Junction Diode:
in p-n junction diode two operating regions are there:
- P-type
- N-type
There are three biasing conditions for p-n junction diode are as follows:
- Zero bias: When there is no external voltage applied to the p-n junction diode.
- Forward bias: P-type is connected to positive terminal of the voltage potential while n-type is connected to the negative terminal.
- Reverse bias: P-type is connected to negative terminal of the voltage potential while n-type is connected to the positive terminal.