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To determine the force experienced by a proton in the same electric field, you need to use the formula:
F = qE
where F is the force, q is the charge, and E is the electric field.
In this case, the charge of a proton is 1.6 x 10^-19 C, and the electric field is 13 N i hat.
So, you can calculate the force experienced by a proton as follows:
F = (1.6 x 10^-19 C) * (13 N i hat)
The direction of the force experienced by the proton can be determined from the direction of the electric field, which is given as i hat.
Therefore, you don't need to perform any division by -3.5 or any other calculations. Simply multiply the charge of a proton with the given electric field.