In a region where the electric field magnitude is directed upward

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

In a region where the electric field magnitude is

2.5\times10^{3}\,\text{N/C}

directed upward, a particle experiences a downward electric force of

4.0\times10^{-3}\,\text{N}

. Determine the magnitude and sign of the particle’s charge.