high School⏱ 4 min

Coulomb's Law

Force between charges F = k·q₁q₂/r²

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r = 2.0 m+3 µC−-3 µCAttractive force

Parameters (k = 8.99·10⁹)

F=k∣q1q2∣r2=2.02e−2 NF = k\frac{|q_1 q_2|}{r^2} = 2.02e-2\,\text{N}

• Like charges repel, opposite charges attract • The stream of dots is faster when the force is larger • Force falls off with the square of distance