Electric Field Calculator
Electric field calculator
Find electric field magnitude from a point charge at a given distance.
Result
1.8724e+6 N/C
Uses E = k|q|/r².
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Advanced options
Flow
- Enter charge magnitude in coulomb.
- Enter distance from charge in meters.
- Read electric field in N/C.
Example
Worked example: q = 3e-6 C, r = 0.12 m
- 1 Square distance: r^2 = 0.0144.
- 2 Multiply Coulomb constant by charge magnitude.
- 3 Divide by r^2 to obtain field magnitude.
Electric field is about 1.87e6 N/C.
How
- Enter charge magnitude in coulomb.
- Enter distance from charge in meters.
- Read electric field in N/C.
Avoid
- Using signed charge in magnitude formula without absolute value.
- Entering distance in centimeters without meter conversion.
Checks
Best fit
Electric Field Calculator is built for compute electric field magnitude from a point charge and distance. If Electric Field Calculator does not match the input scope, compare the answer with a second method.
Input check
Match the entered values to this rule before copying the answer: E = k|q| / r^2.
Sanity check
For Electric Field Calculator, use the worked example as a quick benchmark: Electric field is about 1.87e6 N/C. If the electric field calculator answer is far away, check whether an input, unit, or mode changed.
Before copying
Review this common issue first: using signed charge in magnitude formula without absolute value.
FAQ
Does sign of charge matter?
Direction depends on sign, but this tool reports magnitude.
Can distance be zero?
No. Field expression is undefined at zero distance.
Is this valid for distributed charge?
No. This form is for point-charge approximation.
Switch
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