a coil of wire is also known as a solenoid. the magnetic field is strong and uniform in a soleniod. out side a soleniods the magnetic field is just like one it would be round a bar magnetic (traveling form one pole to the other)
when the current stops so does the magnetic field. this is a magnetic that the magetic field can be turned off and on this is an electromagnet. they usually have an iron core to make the magnet stounger, the more coils the stronger the magnet.
Comments
No comments have yet been made