Coulomb's law calculates the electric force F in newtons (N) between two electric charges q1 and q2 in coulombs (C)
with a distance of r in meters (m):
F is the force on q1 and q2 measured in newtons (N).
k is Coulomb's constant k = 8.988×109 N⋅m2/C2
q1 is the first charge in coulombs (C).
q2 is the second charge in coulombs (C).
r is the distance between the 2 charges in meters (m).
When charges q1 and q2 is increased, the force F is increased.
When distance r is increased, the force F is decreased.
Find the force between 2 electric charges of 2×10-5C and 3×10-5C with distance of 40cm between them.
q1 = 2×10-5C
q2 = 3×10-5C
r = 40cm = 0.4m
F = k×q1×q2/ r2 = 8.988×109N⋅m2/C2 × 2×10-5C × 3×10-5C / (0.4m)2 = 37.705N
Currently, we have around 935 calculators, conversion tables and usefull online tools and features to make your life easier or simply help you to do your work or duties faster and in more effective way. These below are the most commonly used by many users at all
- Free online calculators and tools
- Free online units conversion tools
- Free online web design tools
- Free online electricity & electronics tools
- Online Tools
- Text Tools
- PDF Tools
- Basic Electrical Terms
- Electrical & Electronic Units
- Electronic Components
- Electrical & Electronic Symbols
- Electronic Circuit Laws
- Coulomb's law
- DC circuit laws
- Kirchhoff's laws (KVL / KCL)
- Ohm's law
- Voltage divider rule
- How to save electricity
- How to save energy
And we are still developing more. Our goal is to become the one-stop, go-to site for people who need to make quick calculations or who need to find quick answer for basic conversions.
Additionally, we believe the internet should be a source of free information. Therefore, all of our tools and services are completely free, with no registration required. We coded and developed each calculator individually and put each one through strict, comprehensive testing. However, please inform us if you notice even the slightest error – your input is extremely valuable to us. While most calculators on Justfreetools.com are designed to be universally applicable for worldwide usage, some are for specific countries only.