Electric Fields

Field lines

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Electric field lines point away from + and toward −. Denser lines mean a stronger field.
• Point charge: $E = kQ/r^2$. Force on a charge: $F = qE$.
• The field inside a closed conductor is zero (a Faraday cage).

Steps

1. Field lines
2. Field strength
3. Force from a field
4. Field near a charge
5. Between two plates
6. Inside a car