In a transistor if $\frac{I_C}{I_E}=\alpha$ and $\frac{I_C}{I_B}=\beta$. If $\alpha$ varies between…
In a transistor if $\frac{I_C}{I_E}=\alpha$ and $\frac{I_C}{I_B}=\beta$. If $\alpha$ varies between $\frac{20}{21}$ and $\frac{100}{101}$, then the value of $\beta$ lies between
$1-10$
$0.95-0.99$
$20-100$
$200-300$
Solution
$\beta=\frac{\alpha}{1-\alpha}$
$\beta_1=\frac{\frac{20}{21}}{1-\frac{20}{21}}=20, \quad \beta_2=\frac{\frac{100}{101}}{1-\frac{100}{101}}=100$
The value of $\beta$ lies between $20-100$.