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Electric Charges and Fields
Physics · Chapter 1 · Units 1-2: Electrostatics and Current Electricity
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Your path through this chapter
Visual lesson Beta
- Part 1: Charge, Coulomb’s law and the electric field19 slides
- Part 2: Field lines and the electric dipole16 slides
Flashcards Beta
30 cards for quick recall of key terms and facts.
Review the cards Step 3: Not startedPractice
72 board-style questions with instant checks: Numerical 22, Multiple choice 19, Short answer 15, Long answer 5.
Practise Step 4: Not startedChapter test Free
Short and long chapter tests in board pattern, with results and analysis.
Step 5: Not started- Chapter test (long) — Electric Charges and Fields · 40 marks · 100 min
- Chapter test (short) — Electric Charges and Fields · 20 marks · 50 min
Topics 7
- Frictional electricity; two kinds of charge; conductors and insulators; quantisation and conservation of charge
- Coulomb's law in vector form; SI unit of charge; permittivity of free space and of a medium; comparison with Newton's law of gravitation
- Superposition principle for forces between several point charges
- Electric field E = F/q0; field of a point charge and of a group of charges; F = qE; linear, surface and volume charge densities
- Electric lines of force: properties; patterns for a point charge, a dipole, two like charges and parallel plates
- Electric dipole and dipole moment; field on the axial line and on the equatorial line; short-dipole approximation
- Dipole in a uniform electric field: zero net force; torque tau = p x E