Three point charges are fixed on a straight line: at

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Three point charges are fixed on a straight line:

+8\,\mu\text{C}

x = 0

, an unknown charge

q

x = 0.30\ \text{m}

, and

+2\,\mu\text{C}

x = 0.60\ \text{m}

. What should be the value of

q

so that the net electrostatic force on the

+2\,\mu\text{C}

charge is zero? (a)

-4\,\mu\text{C}

(b)

+2\,\mu\text{C}

(c)

-2\,\mu\text{C}

(d)

-1\,\mu\text{C}