NEET حل شدہ پیپر 2018 سوال 15

سوال: شکل میں دکھائے گئے سرکٹ میں، ان پٹ وولٹیج $ {V_i} $ 20 V ہے، $ V _{BE}=0 $ اور $ V _{CE}=0 $۔ $ {I_B}\text{,}{I_C} $ اور $ \beta $ کی قیمتیں درج ذیل ہیں [NEET - 2018]

اختیارات:

A) $ I _{B}=20\mu A,I _{C}=5mA,\beta =250 $

B) $ I _{B}=25\mu A,I _{C}=5mA,\beta =200 $

C) $ I _{B}=40\mu A,I _{C}=10mA,\beta =250 $

D) $ I _{B}=40\mu A,I _{C}=5mA,\beta =125 $

Show Answer

جواب:

درست جواب: D

حل:

$ {V _{BE}}\text{=0} $ $ {V _{CE}}\text{=0} $ $ {V_b}\text{=0} $ $ {I_C}=\frac{(20-0)}{4\times 10^{3}} $ $ I _{C}=5\times {10^{-3}}=5mA $

$ {V_i}\text{=}{V _{BE}}\text{+}{I_B}{R_B} $ $ {V_i}\text{=0+}{I_B}{R_B} $ $ \text{20=}{I_B}\times 500\times 10^{3} $ $ I _{B}=\frac{20}{500\times 10^{3}}=40\mu A $

$ \beta \text{=}\frac{{l_c}}{{l_b}}\text{=}\frac{\text{25 }\times\text{ 1}{0^{\text{-3}}}}{\text{40 }\times\text{ 1}{0^{\text{-6}}}}\text{=125} $



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