A2L Item 119

• Description: Indicate the direction of the electric force on a charge.
• Goal: Reasoning with Coulomb's Law
• Source: UMPERG-A2LEM3
• Keywords: Forces, Electromagnetism

---

The question for students:

Three charges are positioned on the x-axis as shown. What is the direction of the electrical force on the right-most charge?

---

Commentary for teachers:

Answer

(1) Students who forget to square the denominator in Coulomb’s law will answer (5).

---