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  4. What is the current through an ideal pn - junction diode shown in figure below?

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Q. What is the current through an ideal pn - junction diode shown in figure below?Physics Question Image

AFMCAFMC 2009Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

The potential of $p$-side is more positive than that of $n$-side, hence, diode is in forward biasing.
in forward biasing current flow is possible and $I=\frac{V}{R}$
$=\frac{(3-1)}{100}$
$=20\, mA$ .