Which of the following factors affects the value of a capacitor?

The value of a capacitor is primarily influenced by the physical aspects of its construction, one of which is the size of the plates. The plate size determines the surface area available for storing electric charge; a larger plate area allows for greater charge storage, which increases the capacitance. Capacitance is directly proportional to the area of the plates, meaning that as the plate size increases, the capacitance also increases, leading to a higher value for the capacitor.

In contrast, the color of the dielectric, while potentially indicating certain properties in specific applications, does not intrinsically affect the capacitance value itself. The type of connector, while important for ensuring proper circuit connections, does not impact the capacitive characteristics of the component. Lastly, ambient temperature can influence the performance and efficiency of a capacitor, but it does not change the inherent capacitance value as determined by the physical dimensions and materials used in the capacitor's construction.

Thus, the right choice highlights the fundamental role of plate size in determining the capacitor's electrical properties.