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HSC Physics

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  1. Module 1: Kinematics
    1.1 Motion in a Straight Line
  2. 1.2 Motion on a Plane
  3. Module 2: Dynamics
    2.1 Forces
  4. 2.2 Forces, Acceleration and Energy
  5. 2.3 Momentum, Energy and Simple Systems
  6. Module 3: Waves and Thermodynamics
    3.1 Wave Properties
  7. 3.2 Wave Behaviour
  8. 3.3 Sound Waves
  9. 3.4 Ray Model of Light
  10. 3.5 Thermodynamics
  11. Module 4: Electricity and Magnetism
    4.1 Electrostatics
  12. 4.2 Electric Circuits
  13. 4.3 Magnetism
  14. Module 5: Advanced Mechanics
    5.1 Projectile Motion
  15. 5.2 Circular Motion
  16. 5.3 Motion in Gravitational Fields
    2 Topics
  17. Module 6: Electromagnetism
    6.1 Charged Particles, Conductors and Electric and Magnetic Fields
  18. 6.2 The Motor Effect
    1 Topic
  19. 6.3 Electromagnetic Induction
  20. 6.4 Applications of the Motor Effect
    1 Topic
  21. Module 7: The Nature of Light
    7.1 Electromagnetic Spectrum
    3 Topics
  22. 7.2 Light: Wave Model
  23. 7.3 Light: Quantum Model
    2 Topics
  24. 7.4 Light and Special Relativity
  25. Module 8: From the Universe to the Atom
    8.1 Origins of the Elements
    5 Topics
  26. 8.2 Structure of the Atom
    3 Topics
  27. 8.3 Quantum Mechanical Nature of the Atom
    2 Topics
  28. 8.4 Properties of the Nucleus
    2 Topics
  29. 8.5 Deep Inside the Atom
    4 Topics
Lesson 16, Topic 2
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Force Between Two Current Carrying Conductors

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Current-carrying conductors placed adjacent to one another will experience a force. The moving charges in the different conductors produce magnetic fields which interact with each other to produce these force(s).

Screen Shot 2020 11 05 at 4.01.21 pm

Ampere’s law describes the relationship between current, distance and force between two current-carrying conductors. Use the right-hand grip rule (see right) to determine the direction of the induced magnetic fields. Remember that same-direction fields repel while opposites attract.

\frac{F}{l}=\frac{\mu _0}{2\pi} \frac{I_1 I_2}{d}
  • μ0 = the magnetic permeability constant
  • l = the common length of the parallel conductors

The Ampere

The Ampere was defined in 1954 using Ampere’s law. The official definition was as follows:

The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible cross-section, and placed 1 metre apart in a vacuum, would produce between these conductors a force equal to 2 \times 10^{-7}[\katex] newton per metre of length.