Question $12$

The drawing shows a square, each side of which has a length of $L$

$=0\mathrm{.}25m.$ On two corners of the square are fixed positive charges

$q_1$ and $q_2.$

$q_1=+1\mathrm{.}5{10}^{-\text{s}\text{u}\text{p}}C,q_2=+4\mathrm{.}0{10}^{-\text{s}\text{u}\text{p}}C$

Find the electric potential energy of a third charge $q_3=-6{10}^{-9}$

C$.$ placed at corner B$.$

$-1\mathrm{.}09{10}^{-7}J$

$9\mathrm{.}46{10}^{-7}J$

$-9\mathrm{.}46{10}^{-7}J$

$1\mathrm{.}09{10}^{-7}J$