The current gain of a common emitter amplifier is $69$ . If the emitter current is $7.0 m A$ , collector current is:

9.6 m A

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6.9 m A

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0.69 m A

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69 m A

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Solution

The correct option is C $6.9 m A$
Current gain of CE amplifier $= β$
$i_{c} = β i_{b} = α i_{e}$

$α = \frac{β}{β + 1}$

$i_{c} = \frac{β}{β + 1} i_{e}$

$i_{c} = \frac{69}{70} \times 7 \times 10^{- 3} A$

$i_{c} = 6.9 m A$

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