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Read About Electric & Magnetic Fields

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Electric & Magnetic Fields | Reading Material | Grades 6-8
WHAT ARE ELECTRIC AND MAGNETIC FIELDS?

We can think of forces as pushes and pulls, and we normally think of one object pushing or pulling another object by touching it. But sometimes an object can push or pull on another one without touching. Forces that can act over a distance like this are explained by fields that can surround an object and exert forces on other objects within that area. Two examples of fields are electric fields and magnetic fields. Although we cannot directly see these fields, we can map them out based on how they affect objects in the field.

To better understand electric and magnetic fields…

WHAT ARE ELECTRIC AND MAGNETIC FIELDS?. We can think of forces as pushes and pulls, and we normally think of one object pushing or pulling another object by touching it. But sometimes an object can push or pull on another one without touching. Forces that can act over a distance like this are explained by fields that can surround an object and exert forces on other objects within that area. Two examples of fields are electric fields and magnetic fields. Although we cannot directly see these fields, we can map them out based on how they affect objects in the field. To better understand electric and magnetic fields…

LET’S BREAK IT DOWN!

Magnetic fields

Magnetic fields

You know that magnets can attract or repel each other, even without touching. Magnets can do this because they produce magnetic fields that can push or pull other magnets and certain types of metal. Magnets do not attract all metals, but iron, nickel, cobalt, and steel are the most common examples of metals that are attracted by magnets. We can use iron filings to map out magnetic fields. A magnetic field appears as lines that extend from one pole of the magnet and curve around to the other pole. The magnetic fields cause the like poles (north-north or south-south) of two magnets to repel each other and the opposite poles (north-south) to attract each other.

Magnetic fields You know that magnets can attract or repel each other, even without touching. Magnets can do this because they produce magnetic fields that can push or pull other magnets and certain types of metal. Magnets do not attract all metals, but iron, nickel, cobalt, and steel are the most common examples of metals that are attracted by magnets. We can use iron filings to map out magnetic fields. A magnetic field appears as lines that extend from one pole of the magnet and curve around to the other pole. The magnetic fields cause the like poles (north-north or south-south) of two magnets to repel each other and the opposite poles (north-south) to attract each other.

Electric fields

Electric fields

Objects that have a positive or negative electric charge also produce fields. Objects usually become charged by rubbing against each other and transferring negatively charged electrons from one area to another. Similar to magnetic poles, like charges (+/+ or -/-) repel each other and opposite charges (+/-) attract each other. You can detect a magnetic field by observing how it affects a charged object. Electric fields do not have uniform strength. An object with a greater charge will have a stronger field, and the field gets stronger as you get closer to the object.