Electric Field Strength Calculator — E = F/q

The electric field tells you the force per unit charge at a point in space. A 1 C test charge in a 500 N/C field feels 500 N.

How to interpret the result

Field lines point away from positive charges. Near Earth's surface the fair-weather field is about 100 N/C downward.

Assumptions

• Test charge small enough not to disturb the field
• Static (electrostatic) field