The condider `alpha` of a transistor is 0.9 .What would be the change in the collector currnt corresponding to a change of 4 mA in the base current in a common emitter arrangement>

Explanation

The current gain `alpha` in common base arrangement is related to the current gain `beta` in common emitter arrangement by the relation,
`beta=(alpha)/(1-alpha)`
Given ,`alpha` =0.9
`therefore beta=(0.9)/(1-0.9)=9`
But `beta=((deltaI_(C))/(deltaI_(B)))_(V_(CE))`
Hence change in collector current
`deltaI_(C)=betadeltaI_(B)=9xx4mA=36 mA`