What is the charge-to-mass ratio of a proton?

The charge-to-mass ratio of a proton is 9.58 × 10⁷ C/kg.

The charge of a proton is +1.6 × 10⁻¹⁹ C and its mass is 1.67 × 10⁻²⁷ kg.

Using the formula:
Charge-to-mass ratio = Charge ÷ Mass

= (1.6 × 10⁻¹⁹) ÷ (1.67 × 10⁻²⁷)
≈ 9.58 × 10⁷ C/kg

This value is positive because a proton carries a positive charge.