Question

what are the disadvantages of magnetic field lines​

Answer 1

Answer:

It is restricted to ferromagnetic materials - usually iron and steel, and cannot be used on austenitic stainless steel. It is messy. Most methods need a supply of electricity.

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Answer 2

Answer:

Disadvantages of the Magnetic Particle method of Non-Destructive Examination are: It is restricted to ferromagnetic materials - usually iron and steel, and cannot be used on austenitic stainless steel. It is messy. Most methods need a supply of electricity.