Magnets and Magnetic Fields
A magnet is a solid that has the property to attract metal. Regardless of how small the magnet is , if left to swing freely, one end of a magnet will always swing toward the north, while the other end will always swing toward the south. The two ends are called the north and south poles of the magnet, respectively. Like magnet poles repel; opposite poles attract. Although in theory a magnet with only one pole could exist, at this point none have been found; all magnets have two poles, and the force of attraction between two poles is directly proportional to the produce of their pole strengths and inversely proportional to the square of the distance between them.
A permanent magnet will exert a focus from a distance away. The space around a magnet in which the magnetic force is felt is called the magnetic field. As with an electric field, the force lines of a magnetic field radiate out from the magnet diverging from the North Pole and converging on the South Pole.
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Electromagnetism
Danish physicist Hans Oersted discovered that a wire carrying an electric current produced a magnetic field in a circular pattern around the wire. Later, French physicist Andre Ampere found that if a wire carrying a current was wound in a coil, like a spring, the magnet effect was greatly increased. These coiled wires are called solenoids. Scientists also found that electric current could be produced by magnetism.
Michale Fraday discovered that when one pole of a magnet was moved quickly toward a coil of wire, a current was induced. The strength of the current is related to the strength of the magnet, the speed of the motion, and the number of turns in the wire. The direction of the induced current is always such that its magnetic field opposes the operation that causes it.
Circuits
Current will only flow in a complete circuit that includes a source of emf and a complete conducting path. Charge moves in a circuit from a point of high potential to one of low potential. In addition, any current that flows into a point in the circuit must also flow out; thus, current in a circuit is conserved. When the path of a circuit is complete so that electricity is free to flow, the circuit is called a closed circuit. If the path is interrupted at any point, the circuit is called an open, or broken, circuit.
Circuits may consist of combination of devices such as resistors, capacitors, inductors, and switches, When a number of circuit elements are connected to provide a single conducting path, they are said to be in series. If the elements are set up to provide several paths, they are said to be in parallel.
A magnet is a solid that has the property to attract metal. Regardless of how small the magnet is , if left to swing freely, one end of a magnet will always swing toward the north, while the other end will always swing toward the south. The two ends are called the north and south poles of the magnet, respectively. Like magnet poles repel; opposite poles attract. Although in theory a magnet with only one pole could exist, at this point none have been found; all magnets have two poles, and the force of attraction between two poles is directly proportional to the produce of their pole strengths and inversely proportional to the square of the distance between them.
A permanent magnet will exert a focus from a distance away. The space around a magnet in which the magnetic force is felt is called the magnetic field. As with an electric field, the force lines of a magnetic field radiate out from the magnet diverging from the North Pole and converging on the South Pole.
Electromagnetism
Danish physicist Hans Oersted discovered that a wire carrying an electric current produced a magnetic field in a circular pattern around the wire. Later, French physicist Andre Ampere found that if a wire carrying a current was wound in a coil, like a spring, the magnet effect was greatly increased. These coiled wires are called solenoids. Scientists also found that electric current could be produced by magnetism.
Michale Fraday discovered that when one pole of a magnet was moved quickly toward a coil of wire, a current was induced. The strength of the current is related to the strength of the magnet, the speed of the motion, and the number of turns in the wire. The direction of the induced current is always such that its magnetic field opposes the operation that causes it.
Circuits
Current will only flow in a complete circuit that includes a source of emf and a complete conducting path. Charge moves in a circuit from a point of high potential to one of low potential. In addition, any current that flows into a point in the circuit must also flow out; thus, current in a circuit is conserved. When the path of a circuit is complete so that electricity is free to flow, the circuit is called a closed circuit. If the path is interrupted at any point, the circuit is called an open, or broken, circuit.
Circuits may consist of combination of devices such as resistors, capacitors, inductors, and switches, When a number of circuit elements are connected to provide a single conducting path, they are said to be in series. If the elements are set up to provide several paths, they are said to be in parallel.