Exercises: Electric Field

Work through each section in order. Use $k = 9 \times 10^9$ N·m²/C² throughout. Show your work on calculation problems.

Grade 11·22 problems·~35 min·OpenStax Physics (High School)·section·sec-18-3

Work through problems with immediate feedback

Fluency Practice

Use $k = 9 \times 10^9$ N·m²/C². Show your work on calculation problems.

A field line diagram shows 8 lines near a charge and 2 lines far away from the same charge. What does this difference in density indicate?

The artist drew more lines close to the charge by mistake.

The field is stronger near the charge — field line density is proportional to field strength.

More lines were generated near the charge because it is a larger charge.

The field becomes negative as you move away, so fewer lines are drawn.