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In a silicon transister a change of 7.89...

In a silicon transister a change of `7.89 mA` in the emitter current produces a change of `7.8 mA` in the collector current, the base current must change by

A

`0.9 mu A`

B

`9 mu A`

C

`90 mu A`

D

`900 mu A`

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