ELECTROMAGNETISM ELECTROMAGNET Electric current produces a magnetic field

ELECTROMAGNETISM

ELECTROMAGNET Electric current produces a magnetic field Electromagnetism is the relationship between electricity and magnetism

CHARACTERISTICS OF MAGNETIC FIELD PRODUCED BY A CURRENT Can be turned off Can have its direction changed Can have its strength changed

SOLENOID A coil of wire with a current running through it

HOW ARE A SOLENOID AND A BAR MAGNET ALIKE AND DIFFERENT? Alike because both have north and south poles. Different because the poles of the solenoid will change directions with the direction of the current.

ELECTROMAGNET Solenoid with a metallic and magnetic core (iron) Can be turned on or off

INCREASING THE STRENGTH OF AN ELECTROMAGNET Increase Add current in solenoid more loops of wire to solenoid Wind the coils of solenoid closer together Use core a stronger magnetic metal for

WHAT ARE SOME USES OF ELECTROMAGNETS? The uses of electromagnets include: �Recording information on DVDs and i. Pods �Computer hard drives �Credit cards �Lifting heavy objects/ car lifter at the junkyard

COMMON ELECTROMAGNETS

COMMON ELECTROMAGNETS

MAGNETIC INDUCTION Occurs when a magnetic field is created that competes with the Earth’s own magnetic field. Ex: Putting a compass near an electromagnet will cause the compass needle to change directions