Question

what happens to the magnetic effect on an electromagnet when the electric current is switched off?
a. it becomes stronger
b. it changes the direction
c. it does not change
d. it becomes zero
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Answer 1

Explanation:

The magnetic field disappears when the current is turned off. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.

Answer 2

Answer:

d. becomes zero.

Explanation:

When the electric current is switched off, the coil generally loses its magnetism. Such coils are called electromagnets. The electromagnets can be made very strong and can lift very heavy loads. The end of such a crane has a strong electromagnet attached to it.