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The magnetic flux through a surface when the magnetic field is variable relies on splitting the surface into small surface elements, over which the magnetic field can be considered to be locally constant. The total flux is then a formal summation of these surface elements (see surface integration). where B is the magnitude of the magnetic field (the magnetic flux density) having the unit of Wb/m 2 (tesla), S is the area of the surface, and θ is the angle between the magnetic field lines and the normal (perpendicular) to S. The polarity of the induced emf is such that it produces a current whose magnetic field opposes the change that produces it. The induced magnetic field inside any loop of wire always acts to keep the magnetic flux in the loop constant. This inherent behavior of generated magnetic fields is summarized in Lenz's Law. Faraday's Law. Any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be induced in the coil. No matter how the change is produced, the voltage will be generated. What you can conclude from all these observations is that a changing magnetic field will produce a voltage in a coil, causing a current to flow. To be completely accurate, if the magnetic flux through a coil is changed, a voltage will be produced. This voltage is known as the induced emf. The magnetic flux is a measure of the number of magnetic field lines passing through an area. If a loop of wire with an area A is in a magnetic field B, the magnetic flux is given by: If the flux changes, an emf will be induced. There are therefore three ways an emf can be induced in a loop: 1  Change the magnetic field. Lenz's law: The induced emf generates a current that sets up a magnetic field which acts to oppose the change in magnetic flux. Another way of stating Lenz's law is to say that coils and loops like to maintain the status quo (i.e., they don't like change). For the magnetic fields B (magnetic flux density) and H, see magnetic field. In physics, specifically electromagnetism, the magnetic flux (often denoted φ or φB) through a surface is the surface integral of the normal component of the magnetic field B passing through that surface. The SI unit of magnetic flux is the weber (Wb) (in derived units: volt-seconds), and the CGS unit is the maxwell. where B is the magnitude of the magnetic field (the magnetic flux density) having the unit of Wb/m 2 (tesla), S is the area of the surface, and θ is the angle between the magnetic field lines and the normal (perpendicular) to S. As the electric current produces a concentrated magnetic field around the coil, this field flux equates to a storage of energy representing the kinetic motion of the electrons through the coil. The more current in the coil, the stronger the magnetic field will be, and the more energy the inductor will store. Just as the type of conducting material dictates that conductor’s specific resistance to electric current, the type of material occupying the space through which a magnetic field force is impressed dictates the specific opposition to magnetic field flux. When an emf is generated by a change in magnetic flux according to Faraday's Law, the polarity of the induced emf is such that it produces a current whose magnetic field opposes the change which produces it. The induced magnetic field inside any loop of wire always acts to keep the magnetic flux in the loop constant. Faraday's Law. Any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be induced in the coil. No matter how the change is produced, the voltage will be generated. Magnetic flux is usually measured with a fluxmeter, which contains measuring coils and electronics, that evaluates the change of voltage in the measuring coils to calculate the magnetic flux. where B is the magnitude of the magnetic field (the magnetic flux density) having the unit of Wb/m 2 (tesla), S is the area of the surface, and θ is the angle between the magnetic field lines and the normal (perpendicular) to S. When a magnet is moved into a coil of wire, changing the magnetic field and magnetic flux through the coil, a voltage will be generated in the coil according to Faraday's Law. Faraday's Law. Any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be induced in the coil. No matter how the change is produced, the voltage will be generated. Generated Voltage from Changing B. The induced emf (generated voltage) can be calculated from Faraday's Law. According to Lenz's Law the induced current in the coil produces a magnetic field to oppose the change in magnetic field which produced it. Observing the direction of the. in the magnetic field of the bar magnet, you know that the induced current will produce a magnetic field in the opposite direction called the induced field.
https://en.wikipedia.org/wiki/Magnetic_flux http://hyperphysics.phy-astr.gsu.edu/hbase/electric/farlaw.html http://physics.bu.edu/%7Eduffy/PY106/InducedEMF.html https://en.wikipedia.org/wiki/Magnetic_flux http://www.allaboutcircuits.com/textbook/direct-current/chpt-15/magnetic-fields-and-inductance/ http://hyperphysics.phy-astr.gsu.edu/hbase/electric/farlaw.html https://en.wikipedia.org/wiki/Magnetic_flux http://hyperphysics.phy-astr.gsu.edu/hbase/electric/farlaw.html http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/emfchb.html
does magnetic flux produce a current