Describe the electric field produced by a point charge or configuration of point charges and determine the net field by superposition.
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
The sphere and the test charge are removed. The rod has length 4 L and uniform positive linear charge density . 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 from the origin, where .