Faraday’s Law - General Physcis - Lecture Slides, Slides of Physics

Download Faraday’s Law - General Physcis - Lecture Slides and more Slides Physics in PDF only on Docsity! Faraday’s Law Docsity.com Area Change  The sliding bar creates an emf by changing the area in the magnetic field. • Constant magnetic field  The potential was due to the time rate of change of area. t ABvBLV    Docsity.com Magnetic Flux  The product of the field and area perpendicular to the field is the magnetic flux.  The magnetic flux is measured in webers. • 1 Wb = 1 T m2  The magnetic field can be thought of as a flux density. cosABM  A B M Docsity.com Faraday’s Law  The flux can be used to get the induced emf. • Sign indicates polarity  This is Faraday’s Law of induction.  For multiple turns the emf is multiplied. • N turns of wire • N is the flux linkage t M    t N M    Docsity.com Coil Flux  A circular flat coil has 200 turns of wire with a total resistance of 25  and an enclosed area of 100 cm2.  There is a perpendicular magnetic field of 0.50 T that is turned off in 200 ms.  Find the current induced in the coil.  This problem has three parts.  To get the current from the resistance the voltage is needed.  To get the voltage the flux is needed. • Flux linkage works, too  Find the flux first. Docsity.com