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"My Magnet Attracting Money"

'Did you know that US currency is attracted to a magnet? There are iron particles in the ink that is causes this attraction.' Rob Gallagher - Rob the 'MagnetNerd'

 

Making a Magnet
with Electricity

Electric Magnets are created using
thousands of wire loops

 

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We can understand an electric magnet
 by understanding the magnetism
of a single loop of wire

 

 

Ex 3) Magnetic field around a Single Loop of Wire w/ current

 

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A loop of wire with current
creates a little magnet

 

North Pole is either
above or below the loop

 

 

 

 

Finding N. and S. Pole
of a loop of wire


Step 1 - Current travels from (-) to (+)  terminal, DRAW the direction of the current on the wire

 

Step 2 - Palms away, thumb in direction of current

 

Step 3 - Curl fingers of left hand into loop

Why Left and not right??

 

Step 4 - Note where four fingers tips are pointing when they enter the INSIDE of the loop

 

Fingers tips - NORTH POLE of the magnetic field

 

 

 

 

 

 

 

North Pole
 ABOVE or BELOW ??

 

 

Below


South Pole??
ABOVE or BELOW??

 

 

Above

 

 

 

 

 

 

North Pole
 ABOVE or BELOW ??

 

Below

 

 

 

 

 

 

 

North Pole
 ABOVE or BELOW ??

 

 

Above

 

South Pole
 ABOVE or BELOW ???

 

 

Below

 

 

 

 

If (+) and (-) terminals are reversed
the current is reversed.

 

Magnetic Poles?

 

Poles are reversed

 

 

 

 

 

What's wrong with this picture?

 

 

Flux lines never touch

 

Using magnets to
repel crocodiles










Solenoid

 

 

 

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