Motion of Charged Particles in Electric Fields?

📌 CONCEPT: The direction of the force on a charged particle in an electric field is determined by the sign of the charge and the direction of the electric field.

📐 RULE / FORMULA: The direction of the force on a charged particle is given by the equation F = qE, where F is the force, q is the charge, and E is the electric field strength.

💡 WORKED EXAMPLE: A negatively charged particle is placed in an electric field. If the electric field is reversed, the direction of the force on the particle will also be reversed. For instance, if the electric field is directed from left to right, the force on the negatively charged particle will be directed from right to left.

⚠️ COMMON MISTAKE: Students often forget to consider the sign of the charge when determining the direction of the force on a charged particle in an electric field.