Free Electric Field Calculator
Calculate the electric field strength from a point charge using E = k * Q / r².
C
m
Electric Field Strength
898,750.00 N/C
Electric Field Strength vs Charge
Electric Field
The electric field describes the force per unit charge experienced by a test charge placed near a source charge.
Formula
E = k * Q
where k = 8.9875 x 10^9 N·m²/C² is Coulomb's constant. The field points radially outward from positive charges and inward toward negative charges.
Example Calculation
Electric field 10 cm from a 1 microcoulomb charge.
- 01E = k * Q / r²
- 02E = 8.9875e9 * 1e-6 / 0.01
- 03E = 8987.5 / 0.01
- 04E = 898,750 N/C
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