FARADAY'S LAW

• The process of inducing/creating a current in a circuit with a changing magnetic field.

  Electromagnetic induction or Magnetic induction
• It is the voltage generated by a battery or by the magnetic force according to Faraday's Law.

  Electromotive Force (EMF)
• It is a coil of wire that acts as a magnet when an electric current flows through it.

  Solenoid
• It is the rate of transfer of energy (or another physical quantity) through a given surface, specifically electric flux or magnetic flux.


  Flux
• Magnetic fields can be used to produce voltage (EMF) and in a closed circuit, induced electric current.

  Principle of Magnetic Induction
• It is the component of magnetic field that passes through a given surface.

  Magnetic Flux
• What does B means in the Magnetic Flux equation?

  The magnitude of the magnetic field.
• What is the unit of the magnitude of the magnetic field?

  Tesla or when getting the EMF 1Vs per meter squared.
• What is the Unit of Magnetic Flux?

  Webber or Tm2
• What does A means in the equation of Magnetic Flux?

  The area of the surface measured in m2
• What does θ  mean in the equation of Magnetic Flux?

  The angle between the magnetic field lines and the normal (perpendicular) to A.
• What does the point on a surface that is associated with a direction called?

  The surface normal
• An instrument for detecting and measuring small electric currents.

  Galvanometer
• No current flows through the Galvanometer when the switch remains

  closed or open.
• Based on the Faraday's Apparatus, the current is a result of an EMF induced by a changing magnetic field, whether or not there is a path for the current to flow.
• When a wire is moved through a magnetic field, a current is generated in the wire.

  Electromagnetic Induction
• A basic law of electromagnetism that predicts how a magnetic field interact with an electric circuit to produce an EMF.

  Faraday's Law of Induction
• The EMF induced by a change in magnetic flux depends on how many factors?

  3
• What is the first one?

  EMF is directly proportional to the change in flux.
• What is the second?

  EMF is inversely proportional to time.
• third?

  EMF is directly proportional to the number of loops.
• There is an induced current (and therefore an induced voltage) only when the magnetic flux changes over time.
• The current is "induced" because?

  it is created in the wire by magnetic field.
• what does EMF stands for?

  electromotive force
• You need to have a changing magnetic flux to produce an induced voltage.
• Only if the magnetic flux changes with time will we observe a current.
• The faster the flux changes, the larger the induced voltage (EMF).
• By increasing the amount of individual conductors cutting through the magnetic field, the amount of induced EMF produced will be the sum of all the individual loops of the coil, so if there are 20 turns in the coil there will be 20 times more induced EMF than in one piece of wire.
• If the same coil of wire passed through the same magnetic field but its speed or velocity is increased, the wire will cut the lines of flux at a faster rate so more induced EMF would be produced.
• If the same coil of wire is moved at the same speed through a stronger magnetic field, there will be more EMF produced because there are more lines of force to cut.
• Faraday's Law focuses only on the effect of a changing magnetic field on a wire.
• What is magnetic field?

  an invisible force area around magnets and moving electric charges.