Question

Investigatory project on electromagnetic induction

Answer 1

Electromagnetic induction

§ 1 The phenomenon of electromagnetic induction.

Faraday's law

Faraday's experiments



a) The solenoid, closed the galvanometer, pushed into and put forward the permanent magnet. The galvanometer deflection will, and it will be longer than the faster the pushed into and put forward. When you change the direction of the poles of the magnet deflection change.

b) solenoid, closed the galvanometer is inserted coil (another solenoid) through which current is passed. When you turn on and off (ie, any change in the current) is deflection of the galvanometer. Direction of the deviation varies with On - Off, decrease - the current increases, vdviganii - sliding out the coils.

The phenomenon of electromagnetic induction is that in a closed conducting circuit when the flow of magnetic induction covered by this contour, an induction (induced) electric current.
Occurrence of the induced current means that the circuit operates electromotive force Ei - induced emf.



I

 

EMF induction, which occurs in the conducting circuit, equal to the rate of change of magnetic flux through the area bounded by this contour - Faraday's law.



In 1834, E.H. Lenz established the law, allowing to determine the direction of induced current.
Lenz rule: induction loop current always has a direction such that the magnetic field created by it prevents the change in magnetic flux that caused this induced current.

The minus sign in Faraday's Law is a mathematical expression of the rule of Lenz.
If the circuit in which the induced emf is not composed of a single turn, and of N turns (eg, solenoid), if windings are connected in series, Ei will be equal to the emf induced in each of the coils individually:

 



-flux linkage or the total magnetic flux.



If Ф1 =Ф2=…=Фn, then



Because ФB=BScosα, then in order to change the magnetic flux F can be changed:

1)magnetic field ;

2) the area S;

3) the angle α.

§2 Spin current loop in a magnetic field



The phenomenon of electromagnetic induction is used to convert mechanical energy and the energy of the electric current in the generator current loop area S rotates in a uniform magnetic field ()evenly with a constant angular velocity ω.

α = ωt.

Then





At sin ωt=1



and



Because network frequency , then for increase 

need to increase B and S. As can be increased by using powerful permanent magnets or electromagnets to pass large currents. Core with a large electromagnet choose μ. To increase the use of S multiturn coil.

If a current loop placed in a magnetic field, an electric current, then it will be acted torque



and the current loop starts to rotate. Based on this principle of the motor, designed to transform electrical energy into mechanical

Answer 2

Electromagnetic Induction or Magnetic Induction

Explanation:

Electromagnetic induction is the generation of an electromotive power beyond an electric transmitter in a growing magnetic field.

• Michael Faraday is usually credited with the principle of induction in 1831.

• James Clerk Maxwell mathematically expressed it as Faraday's law of induction.

• Lenz's law defines the control of the effected field. Faraday's law was later speculated to enhance the Maxwell–Faraday equation, one of the four Maxwell equalisations in his principles of electromagnetism.

Electromagnetic induction or magnetic induction  has seen many properties, including electric elements such as transformers and inductors, and components such as generators and electric motors.

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