Question 77 of 209

The circuit contains two diodes each with a forward resistance of $50\Omega$ and with infinite reverse resistance. If the battery voltage is $6V$, the current through the $120\Omega$ resistance is _______ $mA$

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Answer: 20

In this circuit ${D}_{1}$ will be forward bias and ${D}_{2}$ will be revers bias.
$∴$ There will be no current through ${D}_{2}$ and ${R}_{2}$
Apply KVL in circuit we get
$+6-50i-130i-120i=0$
$i=\dfrac{6}{300}A=\dfrac{6}{300}\times 1000mA$
$\Rightarrow 20mA$