FARADAY'S LAW

The induced EMF ε is proportional to the rate of change of magnetic flux linkage. $$ε= -N\frac{dφ}{dt}$$ Where N is the number of coils of wire. The EMF is therefore larger the more powerful the magnetic flux density and the faster this flux changes. The negative sign is from Lenz’s law, indicating that the induced EMF opposes this change. [image:http://i.imgur.com/583nq1B.gif]