Three point charges are arranged collinearly on the -axis: • at • at • at

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

Problem

Three point charges are arranged collinearly on the

x

-axis: •

+4.0\,\mu\text{C}

x=-0.20\,\text{m}

•

-3.0\,\mu\text{C}

x=0

•

+5.0\,\mu\text{C}

x=+0.60\,\text{m}

(a) Taking rightward as the positive field direction, calculate the electric field produced by each charge at the point

Q

located at

x=+0.30\,\text{m}

. (b) Hence find the magnitude and direction of the net electric field at

Q

. (c) Comment on how the sign of the central charge influences the direction of the net field at

Q