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AP Physics C: Electricity & Magnetism 8.3 A Describe the Electric Field Produced By a Charged Object or Configuration of Point Charges Questions

Describe the electric field produced by a point charge or configuration of point charges and determine the net field by superposition.

Syllabus
Effective Fall 2024
Course
AP Physics C: Electricity & Magnetism

Exam points

  • determine electric-field direction from source-charge signs and the positive-test-charge convention
  • calculate a net electric-field vector by superposing fields from multiple point charges
  • locate or justify a zero-field point by balancing opposing field contributions
  • interpret or sketch electric-field vectors and field-versus-position graphs
  • relate electric-field direction and magnitude to force or acceleration of a charged particle

AP Physics C: Electricity & Magnetism 8.3 A Describe the Electric Field Produced By a Charged Object or Configuration of Point Charges Questions question 1

[Maximum number: 3]

A nonconducting rod of uniform positive linear charge density is near a sphere with charge -2.0 nC. The rod and sphere are held at rest on the x-axis, as shown in Figure 1. Equipotential lines and positions A, B, C, D, and E are labeled. Adjacent tick marks on the x-axis and the y-axis are 0.40 m apart.

Indicate the direction (not components) of the net electric force exerted on the test charge immediately after the test charge is released from rest.

+x +y Directly away from the sphere -x -y Directly toward the sphere

Without using equations, justify your answer using physics principles.

Figure 3

Figure 3

The sphere and the test charge are removed. The rod has length 4 L and uniform positive linear charge density +λ+\lambda. The rod is held at rest on the x-axis in the orientation shown in Figure 3. Position P (not shown) is located on the x-axis a distance xPx_{\mathrm{P}} from the origin, where xP>4Lx_{\mathrm{P}}>4 L.

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