For a common base amplifier, current gain is $0.70$ . If the emitter current is $8.4 m A$ , then the base current is

0.236 m A

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2.52 m A

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0.59 m A

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8.3 m A

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Solution

The correct option is B $2.52 m A$
$α = 0.7 I_{E} = 8.4 m A ∴ α = \frac{I_{C}}{I_{E}} \Rightarrow I_{C} = α I_{E} = 0.7 \times 8.4 = 5.88 m A$
Also, $I_{E} = I_{C} + I_{B} ∴ I_{B} = I_{E} - I_{C} = 8.4 - 5.88 = 2.52 m A$

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