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  • The circuit shown in the figure contains two diodes each with a forward resistance of <img alt="\mathrm{30\Omega }" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cmathrm%7B30%5COmega%20%7D

The circuit shown in the figure contains two diodes each with a forward resistance of \mathrm{30\Omega }
and with infinite backward resistance. If the battery is 3 V, the current through the \mathrm{50\Omega } resistance is:

Option: 1

zero 


Option: 2

0.01 A


Option: 3

0.02 A


Option: 4

0.03 A


Answers (1)

best_answer

In the circuit the upper diodeD_{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

\mathrm{\mathrm{R}=50 \Omega+70 \Omega+30 \Omega=150 \Omega}

\mathrm{\text { Current in circuit, } \mathrm{I}=\frac{\mathrm{V}}{\mathrm{R}}=\frac{3 \mathrm{~V}}{150 \Omega}=0.02 \mathrm{~A}}

 

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