A charge of 6.4 × 10–7 C experiences an electric force of 1.8 × 10–1 N. What is the electric field strength?

Use the relationship between electric force and field strength: E = F/q. Substituting the values gives E = (1.8 × 10⁻¹ N)/(6.4 × 10⁻⁷ C) = 2.8125 × 10⁵ N/C. Rounded to two significant figures, this is 2.8 × 10⁵ N/C, choice D.

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