PN junction acts as a one way valve for electrons because ___

PN junction acts as a one way valve for electrons because ___.

A. the circuit in which the diode is used, only attempts to pump electrons in one diode
B. electrons tend to follow the direction of the hole
C. there is a little mechanical switch inside a diode
D. when electrons are pump from P to N, free electrons and holes are force apart leaving no way for electrons to cross the junction

Show Answer

Answer: D

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