Figure shows a circuit in which three identical diodes are used .… - Vidyadip

MCQ

Figure shows a circuit in which three identical diodes are used . Each diode has forward resistance of $20\,\Omega $ and infinite backward resistance. Resistors $R_1 = R_2 = R_3 = 50\,\Omega.$ Battery voltage is $6\,V.$ The current through $R_3$ is.....$mA$

✓
$50$
B
$100$
C
$60$
D
$25$

✓

Answer

Correct option: A.

$50$

a
Here, diodes $D_1$ and $D_2$ are forward biased and $D_3$ is reverse biased. Therefore current through $R_3$

$i = \frac{V}{{R'}} = \frac{6}{{120}} = \frac{1}{{20}}A = 50\,mA$

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