Electric Field

Electric Field

The electric field at a point in space describes the force per unit charge that would act on a positive test charge placed there:

E = rac{kq}{r^2}

• E — electric field strength (N/C = V/m)
• k = $8.99 imes 10^9 ext{ N·m}^2/ ext{C}^2$
• q — source charge (C)
• r — distance from the charge (m)

Field vs Force

The field is a property of the source charge alone. Any other charge $q_0$ placed in the field experiences $F = q_0 E$.

Examples (q = 1 μC)

Your Task

Implement electric_field(q, r) returning E in N/C ($k = 8.99 imes 10^9$).