Magnetic fields

• Faraday's law of electromagnetic induction states that the rate of change of magnetic flux linkage with a coil is directly proportional to the induced emf.
• Lenz's law states that the induced emf will be directed such that the current which it causes to flow opposes the change that is producing it.
• Tesla is the SI unit of magnetic flux density where a force of 1N is experienced by 1M length of a conductor carrying 1A current when placed per perpendicular to magnetic field lines.
• Magnetic flux linkage is the product of magnetic flux density, perpendicular area and number of turns of a coil.
• Magnetic flux density is the magnetic field strength per unit length of a conductor carrying unit current when placed perpendicular to magnetic line.