Now as you can see in the picture a common base configuration of BJT. The green markings in the picture are resistances. :p My question is: By KVL : VBB = VBE + IE*RB which means that IE is esentially a constant because VBB , VBE, RB are constants. Now If Voltage Vcb is increased Early effect states that depletion region of CB junction penetrates deeper into the Base region. Which means charge gradient in base increases and hence IE increases . What is the contradiction?