Question
Question: In the circuit shown here, the transistor used has a current gain \(\beta = 100\) what should be the...
In the circuit shown here, the transistor used has a current gain β=100 what should be the base resistor RBso that V CE=5V (neglect VBE)?

A
200×103Ω
B
1×106Ω
C
500Ω
D
2×103Ω
Answer
200×103Ω
Explanation
Solution
: Applying kirchhoff ’s law to mesh ADCEFA

VCC=10=IC×103+VCE
10=IC×103+5
IC=5×10−3A ….. (i)
Applying Kirchhoff’s law to mesh AGBEFA
IB×RB+VBE=VCC=10V
IB×RB+0=10…… (ii)
}{R_{B} = 2 \times 10^{5}\Omega }{= 200 \times 10^{3}\Omega}$$