Introduction:
Lab 5: Electromagnetic Induction
Michael Faraday a renowned scientist determined that a current flowing
in a wire generates an electric field. Induction which involves change in
magnetic field leading t
...
Introduction:
Lab 5: Electromagnetic Induction
Michael Faraday a renowned scientist determined that a current flowing
in a wire generates an electric field. Induction which involves change in
magnetic field leading to generation of and electromotive force (EMF) in
a coil of wire. A good example of this application is the production of
alternating current at power plants.Take for example a coil of
wire,solenoid, as having a uniform magnetic field which is perpendicular
to the plane of coils then the magnetic flux will be given by:
Φ
B =B·AEquation 1 :Field perpendicular to plane
Where A is the cross sectional area of the coil and B is the uniform
magnetic field inside the solenoid. If the field is not constant nor
perpendicular to the coil, the flux can be generalized as:
Φ
B = ∑ B·ΔA(=∫B·dA) area
Equation 2 :Non perpendicular fieldwhere ΔA is a vector with its
magnitude being equal to a small unit of area (dA) and direction
perpendicular to the loop, units being Tesla multiplied by meters
squared.
Faraday also proved that an EMF is induced in the coil of wire, when the
flux changes in the loop of the solenoid, causing a current to move in the
circuit. Through this proof, Faraday’s law can be written as:
EMF =−NΔΦB (=−NdΦB ) Δt dt
Equation 3 : Flux change 1
where N is the number of coils in the solenoid. The negative sign
basically means that an induced current has a direction in which themagnetic field induced by the current opposes the change in flux that
induced the current. A relation from the Lenz’s Law
Experiment 1– A Changing Magnetic Field
This experiment was run in order to qualitatively
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