Two Tiny Grains of Sand Having Charges of 4

question 48

Multiple Choice

Two tiny grains of sand having charges of 4.0 μC and -4.0 μC are situated along the x-axis at x₁ = 2.0 m and x₂ = -2.0 m.What is electric potential energy of these grains relative to infinity? (k = 1/4πε₀ = 9.0 × 10⁹ N ∙ m²/C²)

• A)-36 mJ
• B)36 mJ
• C)0 J
• D)-72 mJ
• E)72 mJ

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