Two tiny grains of sand having charges of 4.0 ?C and -4.0 ?C are situated along the x-axis at x1 = 2.0 m and x2 = -2.0 m

What is electric potential energy of the system of these grains assuming that at infinity the energy of the system is zero? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) -36 mJ
B) 36 mJ
C) 0 J
D) -72 mJ
E) 72 mJ


A

Physics & Space Science

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