Electric Field Calculator
Calculate the electric field strength from a point charge using E = k * Q / r².
Electric Field Strength
898,750.00 N/C
Electric Field Strength vs Charge
Fórmula
## 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| / r²** 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.
Ejemplo Resuelto
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
Preguntas Frecuentes
What are the units of electric field?
Newtons per coulomb (N/C) or equivalently volts per meter (V/m). Both are identical units.
What is the difference between electric field and electric potential?
The field is a vector (force per charge), while potential is a scalar (energy per charge). E = -dV/dr.
Do electric field lines ever cross?
No. If they crossed, a test charge at that point would experience two different force directions simultaneously, which is impossible.
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