PhysicsClassical Physics

Coulomb's Law: Separation of Two 75.0 nC Charges Exerting 1.00 N

Rearrange Coulomb's law to find the distance between equal 75.0 nC point charges when their force has magnitude 1.00 N.

Question

Two point charges each have a charge magnitude of 75.0 nC, a value typical of static electricity. Determine their separation when the electric force between them has magnitude 1.00 N.

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Evidence boundary

This restates OpenStax College Physics, BCcampus 2016 edition, Section 18.3 Exercise 5. The calculation uses the point-charge electrostatic model and the vacuum value of k, also a good approximation for air. The prompt fixes charge and force magnitudes; it does not require an inferred sign, a finite-object geometry, or an experimental measurement.