Answer:
U_total = 3.51 10⁻¹ J
Explanation:
The electic potential energy is
U = ∑ k qi qj / rij
Where k is the Coulomb constant 8.988 109 N m² / C², q are the electric charges and r is the distance between them
Let's apply this equation to our case
Total U = U₁₂ + U₁₃ + U₂₃
The distance between them is the length of the triangle L= 0.3 m, the charge are equal q = 1.40 10⁻⁶ C
U₁₂ = k q₂ / L
All energies are equal for this case, we substitute in the total potential energy
U_total = 3 (k q² / L)
U_total = 6 k q² / L
We calculate
U_total = 6 8,988 10⁹ (1.40 10⁻⁶)² / 0.3
U_total = 3.51 10⁻¹ J
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Answer:
2,250J
Explanation:
W = Fs = (450)(5) = 2,250