three point charges q, 2q and -4q are arranged in an equilateral triangle of side 30 cm if q is equal to 3*10^-7 C, then calculate the potential energy of the system?
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- k(q+2q-4q)÷30×10power-2
- 9×10power9×3×10power-7×1+2-4
- 27×10power2×-1
- -2700J
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