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In a transistor, the base current is $10 \mu \mathrm{A}$ and the emitter current is $1 \mathrm{~mA}$, then the collector current is
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$990 \mu \mathrm{A}$
Base current, $i_B=10 \times 10^{-6} \mathrm{~A}=10 \mu \mathrm{A}$ Emitter current, $\mathrm{i}_{\mathrm{E}}=1 \times 10^{-3} \mathrm{~A}=1000 \mu \mathrm{A}$ $\mathrm{i}_{\mathrm{E}}=\mathrm{i}_{\mathrm{B}}+\mathrm{i}_{\mathrm{C}}$
Collector current $\mathrm{i}_{\mathrm{C}}=\mathrm{i}_{\mathrm{E}}-\mathrm{i}_{\mathrm{B}}$ $=1000-10=990 \mu \mathrm{A}$
Collector current $\mathrm{i}_{\mathrm{C}}=\mathrm{i}_{\mathrm{E}}-\mathrm{i}_{\mathrm{B}}$ $=1000-10=990 \mu \mathrm{A}$
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