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Byju's Answer
Consider the ...
Question
Consider the circuit shown in the figure below:
The cut-in voltage
V
B
E
(
O
N
)
=
0.7
V, then the value of stability factor
S
(
I
C
O
)
is equal to _______.
91
Open in App
Solution
The correct option is
A
91
I
C
=
β
I
B
+
(
1
+
β
)
I
C
O
Differentiate with respect to
I
C
1
=
β
d
I
B
d
I
C
+
(
1
+
β
)
d
I
C
O
d
I
C
1
=
β
d
I
B
d
I
C
+
(
1
+
β
)
1
S
(
I
C
O
)
∂
I
C
∂
I
C
O
=
1
+
β
1
−
β
d
I
B
d
I
C
now,
d
I
B
d
I
C
=
0
S
(
I
C
O
)
=
1
+
β
=
90
+
1
=
91
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