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Sinusoidal AC

A change of ...

Question

A change of $8 m A$ in the emitter current brings a change of $7.9 m A$ in the collector current. The change in base current required to have the same change in the collector current is

A

0.01 m A

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B

1 A

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C

10 m A

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D

0.1 m A

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Solution

The correct option is D $0.1 m A$
In transistors,
$I_{e} = I_{b} + I_{c}$
$Δ I_{e} = Δ I_{b} + Δ I_{c}$
$Δ I_{b} = Δ I_{e} - Δ I_{c}$
$Δ I_{b} = 8 - 7.9 = 0.1 m A$

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