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

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Q. 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 isPhysics Question Image

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

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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 \,\Omega + 70 \,\Omega + 30 \,\Omega = 150\, \Omega $
Current in circuit, $I = \frac{V}{R} = \frac{3\,V}{150\,\Omega} = 0.02\,A$

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