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Q.

The circuit contains two diodes each with a forward resistance of $50 Ω$ sand with infinite revers resistance. If the battery voltage is 6V the current through the $120 Ω$ resistance is $______m A$

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a

10

b

20

c

15

d

30

answer is A.

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Detailed Solution

In this circuit $D_{1}$ swill be formed bias and $D_{2}$ swill be reverse bias
There will be no current through $D_{2}$ and $D_{1}$
Apply KVL in circuit we gets $+ 6 - 50 i - 130 i - 120 i = 0$
$\begin{array}{l} i = \frac{6}{300} A = \frac{6}{300} \times 1000 m A \\ \Rightarrow 20 m A \end{array}$

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