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The Coulomb's Law calculator computes the force between two objects based on their charges, the distance between the objects, and the Coulomb Constant which is a function of the medium such as air or in this case a vacuum.
INSTRUCTIONS: Choose your preferred units and enter the following:
- (q1) Charge of first object
- (q2) Charge of second object
- (r) Distance between charges
Magnetic Force F(r): The calculator returns the force in newtons (N). However, this can be automatically converted to other force units via the pull-down menu.
The Math / Science
Coulomb's Law describes the electrostatic interactions between two oppositely charged particles. The greater the charge on the ions and the smaller the ions are, the stronger the ionic bonding. The force is attractive if the charges are of different signs, and repulsive if they have the same sign. The Coulomb's Law Magnetic Force equation is as follows:
where:
- F is the magnetic force between particles
- k This constant, ke, is given by:
ke= 14⋅π⋅ε0, where ε0 is the electric permittivity of free space - q+ is the charge of body 1
- q- is the charge of body 2
- d is the separation distance between the two centers of the particles
Both q+ and q- have units of Coulombs and d has default units of meters (m).
Supplemental Materials
Khan Academy: Coulomb's Law (with example)
Physics Classroom: Coulomb's Law
References
Whitten, et al. "Chemistry" 10th Edition. Pp. 253
