Question

What are the advantages and disadvantages of electromagnets ?

Answer 1

Answer:

Advantage

No power supply needed

Cling to vertical surfaces

No electrical contact problems

Inexpensive

Disadvantage

Direct field only

Deteriorate with wear

Have to be pulled from test surface

No control over field strength

Answer 2

Answer:

The main advantage of an electromagnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.