HSC Physics

Module 5: Advanced Mechanics5.1 Projectile Motion

5.2 Circular Motion

5.3 Motion in Gravitational Fields2 Topics

Module 6: Electromagnetism6.1 Charged Particles, Conductors and Electric and Magnetic Fields

6.2 The Motor Effect1 Topic

6.3 Electromagnetic Induction

6.4 Applications of the Motor Effect1 Topic

Module 7: The Nature of Light7.1 Electromagnetic Spectrum3 Topics

7.2 Light: Wave Model

7.3 Light: Quantum Model2 Topics

7.4 Light and Special Relativity

Module 8: From the Universe to the Atom8.1 Origins of the Elements5 Topics

8.2 Structure of the Atom3 Topics

8.3 Quantum Mechanical Nature of the Atom2 Topics

8.4 Properties of the Nucleus2 Topics

8.5 Deep Inside the Atom4 Topics
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 Michael
Force Between Two Current Carrying Conductors
Currentcarrying 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).
Ampere’s law describes the relationship between current, distance and force between two currentcarrying conductors. Use the righthand grip rule (see right) to determine the direction of the induced magnetic fields. Remember that samedirection fields repel while opposites attract.
\frac{F}{l}=\frac{\mu _0}{2\pi} \frac{I_1 I_2}{d}
 μ_{0} = 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 crosssection, and placed 1 metre apart in a vacuum, would produce between these conductors a force equal to [katex]2 \times 10^{7}[\katex] newton per metre of length.