to explain what the electrodynamic induction is using a simple experiment.
RcbivFBZmXGtJ1
Before you start, answer the question.
How does an electromagnet work?
R7Z73uo2bvPCk1
The ordered flow of charged particles in a current‑carrying conductorconductorconductor forms the magnetic field around it. Now, we check if the changes in magnetic field can cause the ordered flow of the charge particles in a conductor.
Electromagnetic induction
Experiment 1
Research problem
RIDLTSyDlxMb31
How does the magnetic field influence a conductorconductorconductor?
Hypothesis
R1TQxFZKUfPaN1
Magnetic field can induce a current flow in a conductor.
You will need
R18JbkxmjCEEg1
insulated copper wire,
compass, matchbox or other small box,
magnet,
adhesive tape.
Instruction
R1IFXYKdv3M2a1
1. Wind 50 turns of insulated copper wire around a matchbox. Take the coil of wire off the matchbox. Fasten it with an adhesive tape. Make two such coils.
2. Connect the ends of both coils together. Fix a small compass inside one coil in such way that the compass needle lies along the longer side of the coil.
3. Move the bar magnet into the other coil. Observe what is happening with the compass needle.
4. Move the magnet out of the coil. What is happening with the compass needle?
Summary
RmVja8X2hrSnl1
When the magnet moves inside the coil, the compass needle turns. When the magnet moves out of the coil, the needle turns in the opposite direction.
R1IDDkV0SPL7p
RJmuV5nlxk5dr
Electromagnetic induction
Definition: Electromagnetic induction
RJGNF5ZOnUNsd1
Electromagnetic inductionelectromagnetic inductionElectromagnetic induction is a phenomenon where in a conductorconductorconductor placed in a changing magnetic field an electrical current flows.
R19O5NTNjObAK
Faraday’s law states that when the strength of a magnetic field changes within a closed loop of wire, a current will flow and its magnitude depends on the rate of change of the magnetic field.
Another law, related to the current inducedinducedinduced in a coil by changing magnetic field is the Lenz’s law. It states that the direction of the induced current is such that the magnetic field created by the induced current opposes the initial changing magnetic field.
R1YMyal3e5ju6
R10urJ1t0d8Gy1
The current is inducedinducedinduced in the coil when a bar magnet moves in and out of the coil. The same current is induced if a magnet is fixed and the coil moves. The greater the speed of the movement, the greater the current intensity. When there is no motion, the current intensity is equal to zero.
The same phenomenon is observed when the magnet is replaced by another coil connected to the source of electricity. Here, the current in the first coil produces a magnetic field. This magnetic field induces a current in the second coil, but only in that moment when the magnetic field is changing (coil is moving).
RfXggdIwJEAMC
Remember
RxvtMaKSVPsHm1
Electromagnetic inductionelectromagnetic inductionElectromagnetic induction is a phenomenon where in a conductorconductorconductor placed in a changing magnetic field an electrical current flows.
The current intensity depends on the rate of change of the magnetic field.
Exercises
RE2wXimOXK1Wo
Exercise 1
Exercise 2
Search in the available sources and explain the concept of a generator.
Exercise 3
Explain in English what the electromagnetic induction is.