For the diode D, the forward resistance is zero and the backward resistance is infinite. It is connected in a D.C. circuit as shown in the figure. The potential difference between X and Y is

Options

A. 5 V
B. 10 V
C. 15 V
D. 20 V

Answer

C

Explanation

D is forward biased. The equivalent resistance of 10 K `Omega` and 10 K `Omega` is 5 K`Omega`.
Net resistance across XY is 5 K`Omega` (Parallel Resistance)
`therefore I=30/((5+5)xx10^3)=3xx10^(-3) A `= 3mA