Parallel Plates: the Electric Field Strength in the Space Between

Multiple Choice

Parallel plates: The electric field strength in the space between two closely spaced parallel disks is 1.0 × 10⁵ N/C. This field is the result of transferring 3.9 × 10⁹ electrons from one disk to the other. What is the diameter of the disks? (e = 1.60 × 10^-19 C, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

A) 3.0 cm
B) 1.5 cm
C) 4.5 cm
D) 6.0 cm