Magnets 5 TH GRADE S5P3D. MAGNETS REVIEW ELECTROMAGNETS.

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Presentation transcript:

Magnets 5 TH GRADE S5P3D

MAGNETS

REVIEW

ELECTROMAGNETS

CHARACTERISTIC OF ELECTROMAGNETS

What is the difference between a permanent magnet and an electromagnet?  In an electromagnet the magnetic field is created through electric current in a wire-wound coil and strengthened by a soft-iron core. As soon as you turn off the power, the soft-iron core loses its magnetization.  A permanent magnet is made of ferromagnetic material, which is magnetized by a strong external magnetic field. The magnetically hard material that is used keeps part of its magnetization after the external magnetic field is turned off.

Strengths of permanent and electromagnets  Left: A permanent magnet with field lines  Right: An electromagnet with power source (left), solenoid (orange) and soft-iron core (middle)