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A transistor has a base current of $1 \mathrm{~mA}$ and emitter current $90 \mathrm{~mA}$. The collector current will
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$89 \mathrm{~mA}$
$\quad \mathrm{I}_{\mathrm{C}}=\mathrm{I}_{\mathrm{E}}-\mathrm{I}_{\mathrm{B}}=90-1=89 \mathrm{~mA}$
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