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COULOMB'S LAW

COULOMB'S LAW. Torsion wire (eg μ N per degree of twist). Distance r. 36. 18. 9. Force f. 36. 144. 576. Charged pith balls. Q. Counter weight. F. +. r. -. F. - q. COULOMB'S LAW. Torsion wire (eg μ N per degree of twist). Torsion wire (eg μ N

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COULOMB'S LAW

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  1. COULOMB'S LAW Torsion wire (eg μN per degree of twist) Distance r 36 18 9 Force f 36 144 576 Charged pith balls Q Counter weight F + r - F - q

  2. COULOMB'S LAW Torsion wire (eg μN per degree of twist) Torsion wire (eg μN per degree of twist) Distance r 36 18 9 Force f 36 144 576 Charged pith balls Q Counter weight F + r Charged pith balls - F - q Charles Coulombs apparatus 1784

  3. COULOMB'S LAW Torsion wire (eg μN per degree of twist) Distance r 36 18 9 Force f 36 144 576 Q F r Charged pith balls F - q Charles Coulombs apparatus 1784

  4. COULOMB'S LAW The force between two charges is proportional to each of the charges and inversely proportional to the square of their distance apart. Q F r F - q

  5. COULOMB'S LAW The force between two charges is proportional to each of the charges and inversely proportional to the square of their distance apart. The electrostatic force can be either positive or negative. + + , _ _ repell, + _ attract Q F r F - q

  6. COULOMB'S LAW The force between two charges is proportional to each of the charges and inversely proportional to the square of their distance apart. The electrostatic force can be either positive or negative. + + , _ _ repell, + _ attract F = k qQ r2 k = 9.0x 109 (N m2 C- 2 ) Q F r F - q

  7. COULOMB'S LAW The force between two charges is proportional to each of the charges and inversely proportional to the square of their distance apart. The electrostatic force can be either positive or negative. + + , _ _ repell, + _ attract F = k qQ r2 k = 9.0x 109 (N m2 C- 2 ) Q F r F - q

  8. COULOMB'S LAW The force between two charges is proportional to each of the charges and inversely proportional to the square of their distance apart. The electrostatic force can be either positive or negative. + + , _ _ repell, + _ attract F = k qQ r2 k = 9.0x 109 (N m2 C- 2 ) Q F r The value of k is large so the forces between charges are measurable. Its value depends on the material between the charges. k = 1 4 0 F - q

  9. COULOMB'S LAW The force between two charges is proportional to each of the charges and inversely proportional to the square of their distance apart. The electrostatic force can be either positive or negative. + + , _ _ repell, + _ attract F = k qQ r2 k = 9.0x 109 (N m2 C- 2 ) Q F r The value of k is large so the forces between charges are measurable. Its value depends on the material between the charges. k = 1 4 0 0 = 8.85x 10-12 Fm- 1 F - q

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