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Question

In the circuit shown in figure, when the input voltage of the base resistance is 10 V,Vbe is zero and Vce is also zero. Value of β is
740446_c54bdbb5e34f475081d71cc36e22ff96.png

A
133
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B
154
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C
196
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D
105
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Solution

The correct option is B 133
Given Vi=10 V,Rb=400 kΩ=400×103Ω
Rc=3 kΩ=3×103Ω,Vbe=0
Vce=0,VCC=10 V
As ViVbe=RbIb
100=(400×103)Ib
Ib=10400×103=25×106A=25μA
and VCCVce=IcRc
Ic=103×103=3.33×103=3.33mA
β=IcIb=3.333×10325×106=133.
754570_740446_ans_8b21c006e6064cfa892f102c48a48e28.png

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