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Matter & Energy
Math Review
Kinematics
Defining Motion
Graphing Motion
Kinematic Equations
Free Fall
Projectile Motion
Relative Velocity
Dynamics
Newton's 1st Law
Free Body Diagrams
Newton's 2nd Law
Static Equilibrium
Newton's 3rd Law
Friction
Ramps and Inclines
Atwood Machines
Momentum
Impulse & Momentum
Conservation Laws
Types of Collisions
Center of Mass
UCM & Gravity
Uniform Circular Motion
Gravity
Kepler's Laws
Rotational Motion
Rotational Kinematics
Torque
Angular Momentum
Rotational KE
Work, Energy & Power
Work
Hooke's Law
Power
Energy
Conservation of Energy
Fluid Mechanics
Density
Pressure
Buoyancy
Pascal's Principle
Fluid Continuity
Bernoulli's Principle
Thermal Physics
Temperature
Thermal Expansion
Heat
Phase Changes
Ideal Gas Law
Thermodynamics
Electrostatics
Electric Charges
Coulomb's Law
Electric Fields
Potential Difference
Capacitors
Current Electricity
Electric Current
Resistance
Ohm's Law
Circuits
Electric Meters
Circuit Analysis
Magnetism
Magnetic Fields
The Compass
Electromagnetism
Microelectronics
Silicon
P-N Junctions
Transistors
Digital Logic
Processing
Integration
Waves & Sound
Wave Characteristics
Wave Equation
Sound
Interference
Doppler Effect
Optics
Reflection
Refraction
Diffraction
EM Spectrum
Modern Physics
Wave-Particle Duality
Models of the Atom
M-E Equivalence
The Standard Model
Relativity
MAGNETISM
Magnetic Fields
The Compass
Electromagnetism
Electromagnetism
In 1820, Danish physicist Hans Christian Oersted found that a current running through a wire created a magnetic field, kicking off the modern study of electromagnetism.
Moving electric charges create magnetic fields. You can test this by placing a compass near a current-carrying wire. The compass will line up with the induced magnetic field.
To determine the direction of the electrically-induced magnetic field due to a long straight current-carrying wire, use the first right hand rule (RHR) by pointing your right-hand thumb in the direction of positive current flow. The curve of your fingers then shows the direction of the magnetic field around a wire (depicted at right).
You can obtain an even stronger magnetic field by wrapping a coil of wire in a series of loops known as a solenoid and flowing current through the wire. This is known as an electromagnet. You can make the magnetic field from the electromagnet even stronger by placing a piece of iron inside the coils of wire. The second right hand rule tells you the direction of the magnetic field due to an electromagnet. Wrap your fingers around the solenoid in the direction of positive current flow. Your thumb will point toward the north end of the induced magnetic field, as shown below.
Explanation:
