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PhysicsClassical Physics

Electric Field Units: Field and Force on a Negative Charge

Find the electric field from an upward force on a positive charge, then calculate the force on a negative charge at the same point.

Question

At a particular point in an electric field, a particle carrying charge +2.0×10−8 C+2.0\times10^{-8}\,\mathrm{C} is acted on by an upward electric force of magnitude 4.0×10−6 N4.0\times10^{-6}\,\mathrm{N}.

(a) Determine the electric field at this point.

(b) Replace the particle with charge q=−1.0×10−8 Cq=-1.0\times10^{-8}\,\mathrm{C} at the same point. Determine the electric force on this charge.

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Evidence boundary

Both answers concern the same specified external electric field at the same point. Upward is chosen as positive solely to display vector signs. No field source, spatial uniformity, particle mass, or acceleration is inferred from the problem.