In the circuit diagram, the battery, diodes $D_1$ and $D_2$, bulbs $B_1$ and $B_2$ are connected as shown. Which of the following statements is true regarding bulbs $B_1$ and $B_2$?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Only $B_2$ will glow
$\text{For diode conduction:}$
$\;\;\;$• A diode conducts only when it is forward biased.
$\;\;\;$• If reverse biased, it blocks current.
In the given circuit:
$\;\;\;$• $D_2$ is forward biased, so current flows through $B_2 \Rightarrow B_2$ glows.
$\;\;\;$• $D_1$ is reverse biased, so no current flows through $B_1 \Rightarrow B_1$ does not glow.
${\text{Only } B_2 \text{ will glow}}$