FIGURE 20-10 -Two Point Charges of Magnitude +4.00 μC and +2.00 μC

FIGURE 20-10
-Two point charges of magnitude +4.00 μC and +2.00 μC are placed at the opposite corners of a rectangle as shown in Figure 20-10. What is the potential at point A due to these charges?

A) +9.00 × 10³ V
B) -9.00 × 10³ V
C) -90.0 × 10³ V
D) +90.0 × 10³ V
E) +900 × 10³ V