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I was brushing my basics about diode & got stuck at a point...my question is

  1. Consider a diode let the positive terminal of the diode be connected to +ve of battery enter image description here

Now in the figure let the base be open & Ic=0mA. Now when i measure the voltage across point A w.r.t ground the voltage reading will be +Vcc .I don't understand how the voltage is +Vcc, I mean how is the potential at point A equal to +Vcc.Can somebody please explain?

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For a diode, no voltage means no current (and vice versa). That is, an operating point of a diode is (0 V, 0 A). So with $I_c=0$, there is no voltage dropped across the diode, so point $A$ is at the same potential as $V_{cc}$

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