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The transistor(β = 100) as shown in the circuit is operating in:
  • a)
    Cut-off region
  • b)
    Saturation region
  • c)
    Active region
  • d)
    Either in active or saturation region
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The transistor(β = 100) as shown in the circuit is operating in:a...
Region of operation of BJT:
In a given circuit, the region of the transistor can be decided through the following procedure.
  • Assume that the transistor is in the saturation region.
  • Calculate Base current (IB) and collector current (IC) separately.
  • Calculate the minimum Base current (IB)min required to operate the transistor in saturation.
  • Compare Base current (IB) and (IB)min
IB  ≥   (IB)min, Transistor is in the Saturation region.
IB < (IB)min, Transistor is in the Active region
IB  < 0, Transistor is in the Cut-off region.
Formula:
In saturation,
Base-Emitter voltage = VBE = 0.8 V
Collector-Emitter voltage VCE = 0.2 V
(IB)min = (IC)sat / β  ----(1)
(IC)sat  = Collector current in Saturation 
β = DC current gain

Assume transistor in Saturation region.
Apply KVL in the outer loop:
5 - IC(Sat) x 5kΩ - VCE(Sat) = 0

Now, Apply KVL in Emitter Loop; 

Hence, BJT is in saturation region.
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The transistor(β = 100) as shown in the circuit is operating in:a)Cut-off regionb)Saturation regionc)Active regiond)Either in active or saturation regionCorrect answer is option 'B'. Can you explain this answer?
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