Question

In the below given arrangement determine the ammeter reading, if each diodes have a forward resistance of $50\Omega$ and infinite backward resistance-

• A. zero
• B. 0.02
• C. 0.03
• D. 0.036

Answer 1

Answer: (B)

0.02

The diode, that is connected with the $50\Omega$ resistor is in negative bias. So, no current will be passing through that portion.

Now, if we think of an equivalent circuit, we can see that three resistors, i.e., $50\Omega$, $150\Omega$ and $100\Omega$ are connected in series with a $6\text{V}$ source.

Therefore, the reading of the ammeter is $\frac{6\text{V}}{\left(50+150+100\right)\Omega }=\frac{6}{300}\text{A}=\text{0}\text{.02A}$