U3T2:MG:Electromagnetic Induction

The strength of a magnetic field or the number of magnetic field lines per unit area. Measured in weber, Wb.

Magnetic fields are regions of space where a magnetic force is experienced.

The production of an EMF or voltage across an electrical conductor due to its dynamic interaction with a magnetic field.

<p>A difference in potential that tends to give rise to an electric current; measured in volts V. EMF equals the rate of change of a magnetic flux.</p> Signup and view all the answers

<p>Lenz's law states that the direction of an electric current induced in a conductor by a changing magnetic field is such that the magnetic field created by the induced current opposes changed in the magnetic field that produced it. Lenz's law obeys the law of conservation of energy. This means that the induced EMF causes an induced current that will have a magnetic field (flux), which will oppose the original change in the magnetic field (flux).</p> Signup and view all the answers

<p>Faraday's law explores the relationship between different factors and the magnitude of the induced EMF, while Lenz's law explains how an induced EMF causes an induced current.</p> Signup and view all the answers

<p>There needs to be a dynamic interaction between a magnetic field (i.e. magnet) and an electrical conductor (i.e. solenoid). As the north pole of the magnet approaches the solenoid, the coil will produce a north pole at this end to repel the incoming magnetic. Work has the be done to overcome the repulsion and cause the magnet to continue to move. The mechanical energy required to do this work is transformed into electrical energy to conserve the overall energy in the system, and obey the law of conservation of energy. A current is induced which will opposed the change in the circuit (Lenz's law). This movement causes an EMF to be produced.</p> Signup and view all the answers

<p>Transformers operate on the principle of Faraday's law by which the varying magnetic field (flux) in one coil induces an EMF is the second coil it is connected to.</p> Signup and view all the answers