The potential difference across the collector of a transistor, used in common emitter mode is 1.5 V , with the collector resistance 3kΩ. Find the emitter current in mA , if gain of transistor is 50.

VCE=1.5V, RC=3kΩ=3000Ω,β=50ie=?We know that, ie=ib+ic   .............(1)Ohm's Law across output side, ic=VCERC=1.53000=0.5×10−3AGain , β=IcIb ⇒Ib=Icβ=0.5×10−350=0.01×10−3A,Ie=Ib+Ic =0.01×10−3+0.50×10−3 =0.51×10−3=0.51mA