In a common base connection, if the emitter current is 2 mA and collector current is 1.95 mA, then the base current will be: 

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MPPGCL JE Electrical 19 March 2019 Shift 2 Official Paper
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  1. 3.95 mA
  2. 1.02 mA
  3. 0.05 mA
  4. 0.975 mA

Answer (Detailed Solution Below)

Option 3 : 0.05 mA
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Detailed Solution

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Concept

1.) Common emitter current gain (β)

\(\beta={I_C\over I_B}\)

2.) Common base current gain (α)

\(\alpha={I_C\over I_E}\)

3.) Common collector current gain (γ)

\(\beta={I_E\over I_B}\)

Also, \(I_E=I_C+I_B\)

where, IC = Collector current

IB = Base Current

IE = Emitter current

Calculation

Given, IE =  2 mA

IC = 1.95 mA

\(2=1.95+I_B\)

IB = 0.05 mA

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