What you’ll learn10 learning objectivesChoose one objective for a focused lesson, or study the complete topic.—D.2.1—Electric charge forces• Direction of forces between the two types of electric charge.Syllabus objective—D.2.2—Coulomb’s law• Coulomb’s law: F=kq1q2/r^2 for point charges; k=1/(4πε0).Syllabus objective—D.2.3—Charge conservation• Conservation of electric charge.Syllabus objective—D.2.4—Millikan experiment• Millikan’s experiment as evidence for quantization of electric charge.Syllabus objective—D.2.5—Charge transfer• Charge transfers by friction, electrostatic induction or contact.• Grounding can remove or add charge.Syllabus objective—D.2.6—Electric field strength• Electric field strength: E=F/q.Syllabus objective—D.2.7—Electric field lines• Electric field lines.Syllabus objective—D.2.8—Field-line density• Relationship between field line density and field strength.• Greater field-line density indicates stronger field.Syllabus objective—D.2.9—Parallel-plate field• Uniform field between plates: E=V/d.Syllabus objective—D.2.10—Magnetic field lines• Magnetic field lines.Syllabus objective