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Physics
Semiconductors and Electronic Devices
When the emitter current in a transistor is changed by 1 mA, then its collector current changes by 0.99 mA. The value of its common base current gain will be:
1.99
9.99
0.999
0.99
$α=\frac{ΔI_C}{ΔI_E}=\frac{0.99}{1}=0.99$