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Atoms

Question

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The current gain for a transistor working as common-base amplifier is 0.96. If the emitter current is 7.2 mA, then base current is

0.35 mA

0.28 mA

0.39 ma

0.43 mA

Solution

C.

0.39 ma

The current gain from the Collector terminal to the Emitter terminal, I_C / I_E is called ( $α$ )

$α = \frac{I_{C}}{I_{E}}$

∴ I_C = $α$ I_E

= 0 $\cdot$ 96 × 7 $\cdot$ 2

I_C = 6 $\cdot$ 91 mA

Now

I_E = I_C + I_B

∴ I_B = I_E $-$ I_B

= $7 \cdot 2 - 6 \cdot 91$

I_B = 0.29 mA

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