Final answer:
The electric force on a proton in a uniform electric field can be calculated using the formula F = q * E, where F is the force, q is the charge of the proton, and E is the electric field strength. In this case, the electric force on the proton is 5.6 x 10^-17 N in the direction of the electric field.
Step-by-step explanation:
The electric force experienced by a proton in a uniform electric field can be found using the formula:
Electric force (F) = charge of the proton (q) * electric field strength (E)
Given that the magnitude of the electric field is 349 N/C and the charge of a proton is 1.6 x 10-19 C, the formula becomes:
Electric force (F) = (1.6 x 10-19 C) * (349 N/C) = 5.6 x 10-17 N
The electric force on the proton is 5.6 x 10-17 N in the direction of the electric field.