What does electric field strength mean physically?

It's the force per unit of positive test charge that would be experienced at that point — multiply the field by a test charge's magnitude to get the force on it.

Why does this use absolute value of charge?

Field strength (magnitude) is always positive; the sign of the actual charge only determines the field's direction (pointing away from positive charges, toward negative ones).

Electric Field (Point Charge) Calculator

Calculate the electric field strength produced by a point charge at a given distance, using Coulomb's constant. The field describes the force per unit charge that would be felt by a test charge at that location.

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Formula

E = k × |Q| / r², where k = 8.99×10⁹ N·m²/C²

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