4.which one of the following devices make electromagnet

A.the coiled wire
B.the dry cells as the source of electricity
C.the pins attracted to electromagnet
D.the nail as the core

5.what happens in the part of an electromagnet is disconnected

A.its loses his magnetism
B.electricity continues to flow through it
C. the electromagnets becomes a permanent magnet
D. there is an increase in the number of materials attracted

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