For the BJT QL in the circuit shown below gate ece 2011

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GATE-ECE-2011--->View question


For the BJT QL in the circuit shown below, -gate-ece-2011

 The switch is initially closed. At time t = 0, the switch is opened. The time t at which Q1 leaves the active region is 

(A) 10 ms (B) 25 ms (C) 50 ms (D) 100 ms 


By:prajwalamv

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Answers

Answer is: (C) 50 ms
Explanation:
Apply KVL in the BE junction:

Note on:
BJT: A bipolar junction transistor (bipolar transistor or BJT) is a type of transistor that uses both electron and hole charge carriers. In contrast, unipolar transistors, such as field-effect transistors, only use one kind of charge carrier. For their operation, BJTs use two junctions between two semiconductor types, n-type and p-type.
BJTs are manufactured in two types, NPN and PNP, and are available as individual components, or fabricated in integrated circuits, often in large numbers. The basic function of a BJT is to amplify current. This allows BJTs to be used as amplifiers or switches, giving them wide applicability in electronic equipment, including computers, televisions, mobile phones, audio amplifiers, industrial control, and radio transmitters.
KVL: This principle is known as Kirchhoff’s Voltage Law (discovered in 1847 by Gustav R. Kirchhoff, a German physicist), and it can be stated as such:
“The algebraic sum of all voltages in a loop must equal zero”
By algebraic, I mean accounting for signs (polarities) as well as magnitudes. By loop, I mean any path traced from one point in a circuit around to other points in that circuit, and finally back to the initial point. It doesn’t matter which point we start at or which direction we proceed in tracing the loop; the voltage sum will still equal zero.

Aparna-Dasgupta

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