Electric Magnets are created using thousands of wire loops
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
A loop of wire with current creates a little magnet
North Pole is either above or below the loop
How to find the North and South Pole of a loop of wire
Step 1 - KNOW - 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
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