The circuit shown in the figure contains two diodes each with a forward resistance of 30 `Omega` and with infinite backward resistance. If the battery is 3 V, the current through the 50 `Omega` resistance (in ampere) is

Options

A. zero
B. 0.01
C. 0.02
D. 0.03

Answer

C

Explanation

In the circuit the upper diode `D_1` is reverse biased and the lower diode `D_2` is forward biased. Thus there will be no current across upper diode junction. The effective circuit will be as shown in figure.
Total resistance of circuit, R = 50 + 70 + 30 = 150 `Omega`
Current in circuit, `I=V/R=(3V)/(150 Omega)=0.02 A`