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Q. Reverse bias applied to a p-n junction diode

J & K CETJ & K CET 2011Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

In reverse bias applied to a p-n junction diode raises the potential barrier because p-type material conncted to the negative terminal and pullesthe holes away from the junction.
Similarly n-type material connected to positive terminal and pulles the electrons. Therefore the depletion region widens.