HSSC-II (12th Class) Physics Unit-17: Electronics: Numerical Problems List (New Book/KPK Text Board, Peshawar) With Verified Answers

1: In a certain circuit, the transistor has a collector current of 10 mA and a base current of 40 μA. What is the current gain of the transistor Answer (250) 

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2: The current flowing into the base of a transistor is 100 μA. Find its collector current Ic, its emitter current Iɛ, and the ratio Ic / Iɛ  If the value of current gain β is 100. Answer (10 mA, 10.1mA, 0.99) 

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3: A transistor is connected in CE configuration. The voltage drop across the load resistance (Rc) 3 k Ω is 6 V. Find the base current. The current gain a of the transistor is 0.97. Answer (2.06 ｘ10⁻³ A) 

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4: In a common base circuit, the current gain is 0.96. If the collector current is 60 μA. Find the emitter current. Answer (122.5 μA) 

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5: In transistor, the emitter current (Iɛ) is 3.5 A and collector current (lc) is 2.35 A find the base current. Answer ( 1.15 A)

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