In reverse bias condition, the diode can be represented by which of the following

In reverse bias condition, a diode can be represented primarily by an ideal current source in parallel with a reverse saturation current and a high resistance. Here's a brief explanation:

1. Reverse Bias Setup: In this condition, the anode of the diode is connected to the negative terminal of the voltage source, and the cathode is connected to the positive terminal. This configuration prevents significant current from flowing through the diode.

2. Ideal Diode Model: Under reverse bias, the diode does not conduct current (except for a very small saturation current, $I_{S}$), so it can be represented as an open circuit in ideal scenarios.

3. Reverse Saturation Current: The small leakage current that does flow in reverse bias (typically in the microampere range for silicon diodes) is the reverse saturation current. This can be modeled as a current source in parallel with the diode's symbolic representation.

4. High Reverse Resistance: The diode also possesses very high resistance to the flow of current in the reverse direction, which can be conceptualized in circuit models.

In conclusion, in reverse bias, a diode predominantly represents an ideal diode with a small reverse saturation current flowing through a parallel high resistance, while, ideally, it behaves like an open circuit.