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

Options

A. a pn junction
B. an intrinsic semiconductor
C. a p type semiconductor
D. an n type semiconductor

Answer

A

Explanation

When the connection of battery is reversed, the semi conductor device is reverse biased. We know that forward biasing of pn junction the current is of the order milliampere with in reverse biassing the current is of the microampere (negigible). Thus , device is a pn junction.