BRAINCAKEElectric Field Strength
The electric field strength E at a point is the force per unit charge on a small positive test charge placed there: E = F/Q. The unit is N C-1 or V m-1.
E is a vector. For a point charge, E = Q/(4πε0r2), and it points away from a positive charge and towards a negative charge.
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Key terms in this lesson
- Electric field strength
- The electric force per unit charge acting on a small positive test charge placed at a point in an electric field.
More in Electric Fields
- Van de Graaf generator
- Electric Potential
- Equipotentials
- Potential gradient
- The Force between Two Charged Objects
- Coulomb's Law
- Point Charges
- Electric Potential
All 17 lessons in Electric Fields · All AQA A-level Physics topics