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The current gain of a transistor in a common emitter configuration is 50. If the emitter current is 5.5 mA, find the base current.(a) 0.203 A(b) 0.107 mA(c) 0.107 A(d) 0.203 mAThe question was posed to me in semester exam.I'd like to ask this question from Semiconductor Electronics in chapter Semiconductor Electronics : Materials, Devices and Simple Circuits of Physics – Class 12

Answer»

Correct choice is (b) 0.107 mA

The explanation: The expression for CURRENT gain is GIVEN as:

β=\(\FRAC {I_C}{I_B}\)

IC=50IB

Since, IE=IB+IC ➔ IE=IB+50IB

IE=51IB

IB=\(\frac {I_E}{51}=\frac {5.5}{51}\)=0.107 mA



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