For simple fixed bias BJT in common emitter configuration using NPN transistor, base resistance Rb, collector resistance Rc and supply voltage Vcc, the base current __________ with increase in Rb and the emitter current ____________.

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  1. decreases; increases
  2. increases; increases
  3. decreases; decreases
  4. increases; decreases

Answer (Detailed Solution Below)

Option 3 : decreases; decreases
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Fixed bias circuit

The base current is given by:

So if RB increases, then IB decreases.

And the emitter current is given by:

If IB decreases, then IE also decreases.

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