To determine when a diode is forward-biased, it's essential to understand the basic working principle of a diode. A diode allows current to flow in one direction — from the anode to the cathode — when it is forward-biased. In a forward-biased condition, the voltage at the anode is higher than the voltage at the cathode.
Let's analyze the options given to understand when the diode will be forward-biased:
: In this range, both voltages are negative. The diode is not forward-biased because neither condition ensures that the anode is at a higher potential than the cathode.
: While both voltages are positive, without further context, they cannot confirm a forward-bias condition unless the anode voltage is higher than the cathode, which isn't stated here.
: The range includes both negative and positive voltages. However, it doesn't necessarily imply a forward-bias as it depends on the specific anode and cathode voltages.
: This range can suggest a forward bias because a diode becomes forward-biased when the voltage across it is higher at the anode than at the cathode. Here, a small positive voltage or even small negative voltage (like 0V with cathode at -2V) across the diode will still make it forward-biased.
The correct answer is the option corresponding to `0V to -2V`, as it effectively provides a potential difference allowing current to flow from anode to cathode through a forward-biased diode condition.
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