Question

can a crane use a permanent magnet .why or why not? ​

Answer 1

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Electromagnets requires a continuous supply of electrical current to maintain the magnetic field and the magnetic field of electromagnets can be quickly changed by controlling the amount of electric current in the winding. That is, the magnetic field of electromagnets can be quickly increased or decreased, but within the manufacturers rated limits of any electromagnet, and cut-off, as required, by controlling the supply of the amount of electrical current in the winding.

On the other hand, the magnetic field of permanent magnets depend upon the material used in its manufacture and their magnetic field is neither variable nor can be switched off quickly as and when necessary.

Cranes using electromagnets lift and carry their cargo of varying weights of magnetic or ferrous based metals or objects, of course within the safe permissible limit, to the dropping point then release and drop, pile or stack the cargo, as need be, when electric power supply to the winding of the electromagnet is cut off by the operator of the crane.

Using permanent magnets for performing these tasks are rather cumbersome, complicated and not really suitable. This is the reason why cranes use electromagnets instead of permanent magnets.

Answer 2

Answer:

no, the crane cannot use permanent magnet

Because,it is not possible to release load

because the permanent magnet does not loses

their magnetic property

I hope this answer help you