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☆☆☆☆☆A magnetic field is produced by any charged particle in motion. It is a fundamental law of nature (as expressed by the electromagnetic force) that a magnetic field will form around any moving charge. We usually think of moving electrons as creating a magnetic field, and this is absolutely correct, but any moving charge can create a magnetic field.
As for what magnetism is, this question has already been answered, and link is provided below to that question.
SILICON or common sand with doping of the right ratio to make a transistor.
three layers of semiconductor material
by creating two circuit loops
Domains are aligned.
temporary magnets
doping
transistor
magnetic feilds are produced only when current is flowing
"permanent and temporary magnets"
by magnetizing the tape
to decide true or false
True
30 ohms
The device is called a "variac' and it is a type of transformer. It has a variable voltage ouput.
Copper
ammeter
A galvanometer or milliammeter.
