Question

In the figure shown below, which of the diodes are forward biased?}

• A. 1,2,3
• B. 2,4,5
• C. 1,3,4
• D. 2,3,4

Hint:

For forward bias, $V_p>V_n$.

Answer 1

The Correct Option is B

To determine which diodes are forward-biased, we need to analyze the potential differences across each diode. A diode is forward-biased when its anode is at a higher potential than its cathode.

1. Circuit (1): The anode is at +5V and the cathode is grounded (0V), making the diode forward-biased.
2. Circuit (2): The anode is at +10V and the cathode is at -10V. The anode is at a higher potential, so the diode is forward-biased.
3. Circuit (3): The anode is grounded (0V) and the cathode is at -10V, making the diode forward-biased.
4. Circuit (4): The anode is at -10V and the cathode is at -5V. In this case, the cathode is at a higher voltage than the anode, so the diode is reverse-biased.
5. Circuit (5): The anode is grounded (0V) and the cathode is at -10V, which makes the diode forward-biased.

From the analysis above, it is clear that the diodes in circuits 2, 3, and 5 are forward-biased. Therefore, the correct answer is 2, 4, 5.