Section 3.10: Unit 3 Test
This test covers all topics in Unit 3: Coulomb’s Law, electric fields, potentials, superposition, and point charges. Attempt all questions to evaluate your understanding.
Unit 3 Test Questions
- Two point charges +2 μC and -3 μC are 0.5 m apart. Calculate the magnitude and direction of the force on each charge.
- Three charges lie on a straight line: +1 μC, -2 μC, +3 μC, spaced 0.4 m apart. Find the net force on the middle charge.
- Determine the electric field at the midpoint between two charges +4 μC and +4 μC separated by 0.6 m.
- Four equal charges +1 μC are placed at the corners of a square of side 0.5 m. Find the net electric field at the center of the square.
- Calculate the electric potential at a point due to three point charges forming a triangle with sides 0.3 m, 0.4 m, and 0.5 m.
- Explain the difference between electric force and electric field, giving an example of each.
- Two charges +5 μC and -2 μC are separated by 0.3 m. Find the location along the line joining them where the electric field is zero.
- Compute the work done to bring a +1 μC test charge from infinity to the midpoint between two charges +3 μC and -3 μC separated by 0.6 m.
- Explain how the superposition principle is used to determine the net force or field in a system of multiple charges.
- Compare electric potential energy and electric potential for a system of three charges placed in a triangular configuration.