An $n - p - n$ transistor circuit has $α = 0.985$ . If Collector current $I_{c} = 2 m A$ , then value of base current $I_{b}$ is____.

0.03 m A

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0.003 m A

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0.66 m A

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0.015 m A

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Solution

The correct option is A $0.03 m A$
Given $α = 0.985$

$α = \frac{I_{c}}{I_{e}} = \frac{I_{c}}{I_{c} + I_{b}} = 0.985$

$I_{c} = 0.985 (I_{c} + I_{b})$

$I_{c} = 0.985 I_{c} + 0.985 I_{b}$

$0.985 I_{b} = 0.015 I_{c} = 0.015 \times 2 m A$

$I_{b} = \frac{0.015 \times 2}{0.985} = 0.03 m A$

$I_{b} \approx 0.03 m A$

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An n – p – n transistor circuit has $α = 0.985$ . If $I_{c} = 2 m A$ , then value of $I_{b}$ is____.

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