PN-junction diode works as a insulator, if connected :
How is a Zener diode fabricated? What causes the setting up of high electric field even for small reverse bias voltage across the diode?
Describe, with the help of a circuit diagram, the working of Zener diode as a voltage regulator
OR
(a) Explain with the help of a diagram, how depletion region and potential barrier are formed in a junction diode.
(b) If a small voltage is applied to a p-n junction diode, how will the barrier potential be affected when it is (i) forward biased, and (ii) reveres biased?