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In forward mode n-p-n BJT, if we increase the voltage Vcc, the collector current increases
- a)because due to base width decrease, less carrier combine in the base region,
- b)as the gradient of the minority carriers in the base region becomes steeper.
- c)due to ohm’s law, higher Vcc causes higher current.
- d)due to both the reasons (a) and (b).
Correct answer is option 'D'. Can you explain this answer?
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In forward mode n-p-n BJT, if we increase the voltage Vcc, the collect...
Understanding the NPN BJT Operation
In a forward-biased NPN BJT, increasing the supply voltage (Vcc) affects the collector current (Ic) due to several interrelated factors.
Reason A: Base Width Modulation
- As Vcc increases, the electric field across the base-emitter junction becomes stronger.
- This results in a phenomenon known as base width modulation, where the effective width of the base region decreases.
- A narrower base means that fewer minority carriers (holes in the case of an NPN) recombine before reaching the collector.
- Consequently, more electrons can flow from the emitter to the collector, increasing the collector current.
Reason B: Steeper Minority Carrier Gradient
- With a higher Vcc, there is a stronger electric field that induces a steeper gradient of minority carriers in the base.
- This steeper gradient enhances the diffusion of electrons from the emitter into the base, leading to an increased likelihood of these carriers reaching the collector.
- This improved transport of carriers directly contributes to an increase in collector current.
Reason C: Ohm’s Law
- Ohm's Law states that current is directly proportional to voltage (I = V/R).
- An increase in Vcc leads to a higher voltage across the collector-emitter junction, which can also result in an increase in the overall current flowing through the circuit.
Conclusion: Combined Effects
- The increase in collector current is a result of both reasons (a) and (b).
- The modulation of base width and the steeper carrier gradient work together to enhance the flow of carriers, while Ohm's Law provides a fundamental basis for understanding the relationship between voltage and current in the circuit.
- Thus, the correct answer is option 'D' as it incorporates the comprehensive impact of both phenomena.
In a forward-biased NPN BJT, increasing the supply voltage (Vcc) affects the collector current (Ic) due to several interrelated factors.
Reason A: Base Width Modulation
- As Vcc increases, the electric field across the base-emitter junction becomes stronger.
- This results in a phenomenon known as base width modulation, where the effective width of the base region decreases.
- A narrower base means that fewer minority carriers (holes in the case of an NPN) recombine before reaching the collector.
- Consequently, more electrons can flow from the emitter to the collector, increasing the collector current.
Reason B: Steeper Minority Carrier Gradient
- With a higher Vcc, there is a stronger electric field that induces a steeper gradient of minority carriers in the base.
- This steeper gradient enhances the diffusion of electrons from the emitter into the base, leading to an increased likelihood of these carriers reaching the collector.
- This improved transport of carriers directly contributes to an increase in collector current.
Reason C: Ohm’s Law
- Ohm's Law states that current is directly proportional to voltage (I = V/R).
- An increase in Vcc leads to a higher voltage across the collector-emitter junction, which can also result in an increase in the overall current flowing through the circuit.
Conclusion: Combined Effects
- The increase in collector current is a result of both reasons (a) and (b).
- The modulation of base width and the steeper carrier gradient work together to enhance the flow of carriers, while Ohm's Law provides a fundamental basis for understanding the relationship between voltage and current in the circuit.
- Thus, the correct answer is option 'D' as it incorporates the comprehensive impact of both phenomena.
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In forward mode n-p-n BJT, if we increase the voltage Vcc, the collector current increasesa)because due to base width decrease, less carrier combine in the base region,b)as the gradient of the minority carriers in the base region becomes steeper.c)due to ohm’s law, higher Vcc causes higher current.d)due to both the reasons (a) and (b).Correct answer is option 'D'. Can you explain this answer?
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