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Let OAB is the equilateral triangle of side 5 cm . Let each vertex of triangle has charge 2 μC .

Vertex O is at origin and side OA be on x-axis.

Force F_A is electrostatic force on charge at O due to charge at A . Force F_B is electrostatic force on charge at O due to charge at B .

Electrostatic force F between charges q₁ and q₂ that are separated by a distance d is

where K = 9 × 10⁹ N m² C^-2 is Coulomb's constant

Magnitudes of forces F_A and F_B are equal because distance between charges are equal.

we get, |F_A | = | F_B | = 14.4 N

Net force on charge at O is

Magnitude of force is

Hence each charge at the vertex of triangle experiences a force 14.4 N due to other charges