Question

A semiconducting device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops to almost zero. the device may be
(a) an intrinsic semiconductor
(b) a p-type semiconductor
(c) an n-type semiconductor
(d) a p-n junction.

Answer 1

Answer:

junction diode because at junction electron and hole are electrically neutral ise there is no current flow then the value of current becomes zero.

Answer 2

The device may be a p−n junction.

Explanation:

• The current flow is allowed by the p-n junction in the forward bias and the current is stopped in reverse bias, which is almost insignificant reverse leakage flow of current in the p−n junction that is reverse-biased.
• It is the device that must be a p−n junction. Other options like an intrinsic semiconductor, a p-type semiconductor, and an n-type semiconductor are the examples of devices that permit reasonable flow of current and that does not have any consequence of altering the battery’s polarity.