Three point charges are fixed in vacuum at the corners of a right-angled triangle: at

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

Problem

Three point charges are fixed in vacuum at the corners of a right-angled triangle:

q_1=+2\,\mu\text{C}

(0,0)

q_2=-3\,\mu\text{C}

(0,0.30\,\text{m})

, and

q_3=+4\,\mu\text{C}

(0.40\,\text{m},0)

. Taking

k=9\times10^{9}\,\text{N m}^2\text{C}^{-2}

, the total electric potential energy of the system is closest to (a)

+0.22\,\text{J}

(b)

-0.11\,\text{J}

(c)

-0.22\,\text{J}

(d)

0\,\text{J}