Final answer:
The electric field between the plates of the parallel-plate capacitor is 5.0 × 10^8 V/m.
Step-by-step explanation:
The electric field between the plates of a parallel-plate capacitor can be calculated using the formula E = V / d, where E is the electric field, V is the potential difference, and d is the spacing between the plates. In this case, the diameter of the capacitor is 10 cm, so the radius is 5 cm or 0.05 m. The spacing is given as 1.0 mm, which is equivalent to 0.001 m. Therefore, the electric field can be calculated as follows:
E = V / d = (5.0 × 10^5 V/ms) / (0.001 m) = 5.0 × 10^8 V/m.
The electric field is 5.0 × 10^8 V/m.