Physics

Problem

Charges

5.0 \times 10^{-7}\,\text{C}

-2.5 \times 10^{-7}\,\text{C}

and

1.0 \times 10^{-7}\,\text{C}

are held fixed at the three corners A, B, C of an equilateral triangle of side 5.0 cm. Find the electric force on the charge at C due to the rest two.

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