Pn junction is represented as a diode, Physics

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Pn junction is represented as a diode

Pn junction is represented as a diode D in the emitter as represented in figure. If a voltage VBB is applied between bases with emitter open (see fig. (b), circuit would behave as a potential  divider.  Hence, VBB would be  divided  across  RB1 and  RB2 and  voltage across RB1 is 

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