Comparing Electrostatics & Gravity

• Gravity only attracts

• Electrostatics attract and repel

Practice Question 4

• Find the electric field a distance d from a long straight insulating rod of length L at point P perpendicular to the wire and eduidistant from each end of the wire if the wire is uniformly charged

• What if the line is infinitely

long

• What is the E field if the distance d is

infinite?