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MotionLab
The electric version of gravity — like charges repel, opposite charges attract.
Coulomb's law has the same inverse-square form as Newton's gravitational law, but the electrostatic force between two protons is about 10³⁶ times stronger than their gravitational attraction — this enormous difference is why chemistry and biology are governed by electromagnetic forces, not gravity.
When both charges have the same sign the force is positive (repulsive), and when they have opposite signs it's negative (attractive) — the magnitude tells you how strong, and the sign tells you which way.
Electrostatic force (N)
1.798
F = k|q₁q₂| / r²
What you entered
F = k|q₁q₂| ÷ r²
8.988e+9 × |1.00e-6 × 2.00e-6| ÷ 0.1²= 1.7975e+0 NResult
Electrostatic force (N): 1.798
Two charges of 1.00e-6 C and 2.00e-6 C separated by 0.1 m exert a force of 1.7975e+0 N on each other.