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The base current in a transistor circuit changes from $45\;\mu A$ to $140\;mu A$. Accordingly, the collector current changes from $0.2\;mA$ to $4.00\;mA$. The gain in current is

\[(a)\;9.5 \quad (b)\;1 \quad (c)\;40 \quad (d)\;20\]
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(c) 40
answered Nov 7, 2013 by pady_1

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