Test: The PN Junction As a Diode - Electrical Engineering (EE) MCQ

Diode is a one junction semiconductor device which has one cathode and anode. The junction is of p-n type.

When a positive terminal is connected to the anode, the diode is forward biased which lets the flow of the current in the circuit.

When the diode is reverse biased, a small current flows between the p-n junction which is of the order of the Pico ampere. This current is known as reverse saturation current.

When the voltage will be same that of the potential barrier, the potential barrier disappears resulting in flow of current.

Due to the increase in the reverse saturation current due to the increase in the temperature, the back resistance decrease with the increasing temperature.

Emax=-2(V_bi+V_R)/W
=-2(2+5)/ (7*10^-2)
=-200V/m.

Vt=V_bi+V_R
=0.63+6
=6V.

The contacts of the voltmeter have some resistance which will not accurately measure the voltage across the potential barrier. Thus, it is not possible to measure the voltage across the potential barrier.

 V=12-0.7
=11.3V.

Option a is the correct formula.