Question

When negative terminal of a source is
connected to P region and positive terminal is
connected to N region of diode, it is called​

Answer 1

Answer:

A p-n junction diode is said to be reverse-biased when its p-junction is connected to the negative terminal of the battery and the n-junction is connected to the positive terminal of the battery

Answer 2

Answer:

Reverse Biased PN Junction. When the positive terminal of a voltage source is connected to the n-type region and the negative terminal of the source is connected to the p-type region. The PN junction is said to be in reverse biased condition

Explanation:

By convention, forward biasing of diode is defined in such a way that the positive terminal of the battery is connected to the anode (p-type crystal) of the diode whereas the negative terminal of the battery is connected to the cathode (n-type crystal) of the diode.

Moreover when the diode is forward biased then the potential barrier in depletion layer decreases.