Physics
Physics
Problem
Two point charges is placed at coordinates and is fixed at in vacuum. a. (i) Identify whether the electrostatic force on due to is attractive or repulsive. Justify your answer by referring to the sign of the product . b. (ii) Write the direction of the force on due to as a unit vector expressed in Cartesian component form. c. (iii) Explain briefly how your answer to part (ii) is consistent with the nature of force (attraction or repulsion) stated in part (i).Intuitive explanation
This problem is about superposition of electric fields—the idea that each charge creates its own field independently, and the total field at any point is the vector sum of both. The key insight is to find the field contribution from each charge separately using Coulomb's law, then add them as vectors, paying careful attention to direction (positive charges point outward, negative inward). Once you have the net field, you can use it to find forces on test charges or potentials.
Intuitive explanation
This problem is about superposition of electric fields—the idea that each charge creates its own field independently, and the total field at any point is the vector sum of both. The key insight is to find the field contribution from each charge separately using Coulomb's law, then add them as vectors, paying careful attention to direction (positive charges point outward, negative inward). Once you have the net field, you can use it to find forces on test charges or potentials.