What is the electric potential energy of a charge that experiences a force of 3 point 6 times 10 to the negative 4 power cap n when it is 9 point 8 times 10 to the negative 5 power m from the source of the electric field?

For an electric force from a point source, the potential energy at distance r is U = F × r. Substituting the given values gives U = (3.6 × 10⁻⁴ N)(9.8 × 10⁻⁵ m) = 3.528 × 10⁻⁸ J. Rounded to two significant figures, that is 3.5 × 10⁻⁸ J, choice C.

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