Electric Field Strength

Electric Field Strength

Electric Field Strength

Electric field strength at a point is the force experienced per unit positive test charge.

**E = Fq**

where:

0 = field strength;

0 = electric force;

0 = test charge.

Unit:

N/C

Point Charge

For a point charge:

**E = k|Q|/r²**

Direction

For positive source charge, field points outward.

For negative source charge, field points inward.

Uniform Field

Between large parallel plates:

**E ≈ Vd**

where:

0 = potential difference;

0 = plate separation.

Electric Field Strength — Advanced