A point charge is fixed at the origin

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

Problem

A point charge

q=+4\,\mu\text{C}

is fixed at the origin. Another charge

Q

is placed at

(3\,\text{cm},0,0)

. The electrostatic force on

q

is observed to act along the negative

x

-axis. Determine the sign (positive or negative) of

Q