how there is a 180 degree phase shift in output signal of CE
amplifier?

Answer Posted / aslam

since collector voltage of ce amplifier vcc=IcRc and
increase at ic results drop across collector voltage thus,
when input voltage is in positve direction output goes in
negative direction and we get negative half cycle output
voltage for the positive half cycle at the input voltage
therefore we can say that there is a 180 degree b/w I/P AND
O/P voltages in common emmiter

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