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# Coulomb's law

This online calculator calculates unknown (whether force, charge or distance) using known values using Coulomb's law scalar formula. It can be used to solve physics problems.

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The calculator below is about Coulomb's law. It allows you to calculate unknown value (whether force, charge or distance) using known values and scalar formula

The scalar form of theCoulomb's law equation is:
$|\mathbf F|=k_e{|q_1q_2|\over r^2}\qquad$
where k is Coulomb's constant
$k=\frac{1}{4\pi\varepsilon_0}$
with epsilon (electrical constant) is ≈ $8.85418781762*10^{-12} F/m$

This calculator can be useful in solving school physics problems.
Typical problems could look like these:

• Suppose that two point charges, each with a charge of +1.00 Coulomb are separated by a distance of 1.00 meter. Determine the magnitude of the electrical force of repulsion between them
• Two balloons with charges of +3.37 µC and -8.21 µC attract each other with a force of 0.0626 Newton. Determine the separation distance between the two balloons.

Thus, first you choose the value you want to get, then you fill known values and receive answer.

#### Coulomb's law

Digits after the decimal point: 2
Force

Force units

Charge

Charge units

Distance

Distance units

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