Learning objective
D.2.1—Electric charge forces
• Direction of forces between the two types of electric charge.
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Course review
D.2 Electric and magnetic fields
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Learning objective
D.2.2—Coulomb’s law
• Coulomb’s law: F=kq1q2/r^2 for point charges; k=1/(4πε0).
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Learning objective
D.2.3—Charge conservation
• Conservation of electric charge.
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Learning objective
D.2.4—Millikan experiment
• Millikan’s experiment as evidence for quantization of electric charge.
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Learning objective
D.2.5—Charge transfer
• Charge transfers by friction, electrostatic induction or contact. • Grounding can remove or add charge.
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Learning objective
D.2.6—Electric field strength
• Electric field strength: E=F/q.
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Learning objective
D.2.7—Electric field lines
• Electric field lines.
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Learning objective
D.2.8—Field-line density
• Relationship between field line density and field strength. • Greater field-line density indicates stronger field.
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Learning objective
D.2.9—Parallel-plate field
• Uniform field between plates: E=V/d.
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Learning objective
D.2.10—Magnetic field lines
• Magnetic field lines.
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Learning objective
D.2.11 (HL)—Electric potential energy
• Electric potential energy is work to assemble charges from infinite separation.
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Learning objective
D.2.12 (HL)—Two-charge potential energy
• Two-charge electric potential energy: Ep=kq1q2/r.
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Learning objective
D.2.13 (HL)—Electric potential as scalar
• The electric potential is a scalar quantity with zero defined at infinity.
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Learning objective
D.2.14 (HL)—Electric potential
• Electric potential: Ve=kQ/r, zero at infinity.
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Learning objective
D.2.15 (HL)—Electric potential gradient
• Electric field strength is potential gradient: E=-ΔVe/Δr.
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Learning objective
D.2.16 (HL)—Work in electric fields
• Work moving charge in electric field: W=qΔVe.
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Learning objective
D.2.17 (HL)—Electric equipotentials
• Equipotential surfaces for electric fields. • No work is done moving along an equipotential surface.
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Learning objective
D.2.18 (HL)—Equipotentials and electric fields
• Relationship between equipotential surfaces and electric field lines. • Equipotential surfaces are perpendicular to electric field lines.
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