Question

The electric potential energy of the system of three charges given in figure is

• A. $-7.47J$
• B. $7.47J$
• C. $-7.45\times 10^{-5}J$
• D. $7.47\times 10^{-5}J$

Answer 1

Answer: (A)

$U=\frac{9\times 10^9\times 10^{-12}}{10^{-1}}$
$\left[-\frac{8\times 15}{3}-\frac{15\times 20}{4}+\frac{20\times 8}{5}\right]$
$U=-7.47J$