For a transistor, the current amplification factor is 0.8. The transistor is connected in common emitter configuration. The change in the collector current when the base current changes by 6 mA is 
(a) 6 mA                       (b) 4.8 mA
(c) 24 mA                     (d) 8 mA

(c) 

α=0.8β=0.81-0.8=4Also β=icibic=β×ib=4×6=24mA

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