Electric Field at r

`E_A = (2*k* "q" )/( 1 * r_A )`

Enter a value for all fields

The Electric Field calculator computes the electric field intensity based on Coulomb's Constant, the charge, unit length and radius.

INSTRUCTION: Choose units and enter the following:

(q) charge
(L) unit length
(r_A) radius A

Electric Field (E_A): The calculator returns the field strength in Newtons per Coulomb (N/C).

The Math / Science

The Electric Field calculated by this equation computes the electric field intensity at a radial distance `r_A`. The electric field is calculated using the following formula:

`E_A = (2*k*q)/(L*r_A)`

where:

`E_A` = Electric Field at radial distance `r_A`
`k`= Coulomb's Constant (8.9875517873682E9 m/F) = `1/(4*pi*epsilon_0)`, where `epsilon_0` is the permittivity of free space
`q` = charge
`L` = unit length
`r_A` = radius A

NOTE: because `L` is a "unit length", you must always use the value 1 for L, though you may change its units.

References

22.7 Field lines and Gauss's law by Benjamin Crowell, Light and Matter licensed under the Creative Commons Attribution-ShareAlike license.

The Math / Science

References

Electric Field Calculators