Two electrodes with a separation distance of 3.0 cm have an electric field strength of 3.0 × 10⁴ N/C between them. A proton is released from the negative plate at a 30° angle with respect to the horizontal. Find the maximum initial speed that the proton must have in order to just barely miss hitting the positive plate.

• A. 2.8 × 10⁶ m/s
• B. 8.3 × 10⁵ m/s
• C. 4.1 × 10⁵ m/s
• D. 3.1 × 10⁶ m/s

Answer: (B)