PN-junction diode works as an insulator, when connected in? (a) To A.C (b) In forward bias (c) In reverse bias (d) None of these

When the PN junction diode is connected in reverse bias no current flows and works as an insulator.

When a p-n junction diode is used for blocking the electric current in the presence of applied voltage, then the diode is said to a reverse-biased p-n junction diode.

In a reverse-biased p-n junction diode, the n-type semiconductor is connected to the positive terminal of the battery while p-type semiconductor is connected to the negative terminal of the battery.

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