Question

In the given transistor circuit, the base current is $35\mu A$. The value of $R_b$ is -

• A. $100k\Omega$
• B. $200k\Omega$
• C. $300k\Omega$
• D. $400k\Omega$

Answer 1

The correct option is B $200k\Omega$

As the emittter base junction is reverse biased, the voltage drop across it will be zero.
$\Rightarrow 7-I_b{R}_b=0$
$I_b{R}_b=7$
$R_b=\frac{7}{35\times {10}^{-6}}=2\times {10}^5=200k\Omega$