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Coulomb's law
F = kq₁q₂/r², k = 1/(4πε₀)
Where: F = force (N), k = spring constant (N/m) / Coulomb constant, q₁ = charge 1 (C), q₂ = charge 2 (C), r = radius / distance (m)
Solved example
Given: k = 7, q_1 = 5, q_2 = 10, r = 4
Find: F (force (N))
- Formula: F = k·q₁·q₂/r²
- Substitute the values: F = 10·5·7/4²
- Result: F = 21.875 N
Answer: F = 21.875 N
Calculator
How to calculate Coulomb's law
- Write down the formula: F = kq₁q₂/r², k = 1/(4πε₀).
- Note the known values (k, q₁, q₂, r).
- Substitute them and simplify to find F.
- Use the calculator above to solve for any letter.
Frequently asked questions
What is the formula for Coulomb's law?
The formula is F = kq₁q₂/r², k = 1/(4πε₀), where F = force (N), k = spring constant (N/m) / Coulomb constant, q₁ = charge 1 (C), q₂ = charge 2 (C), r = radius / distance (m).
What is Coulomb's law when k = 7, q_1 = 5, q_2 = 10, r = 4?
F = 21.875 N. Substitute the values into F = kq₁q₂/r², k = 1/(4πε₀) and simplify.