railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Physics Magnetism

A company plans to produce magnetic data storage devices. Which of the following type of substance should be used for this task?

1
Diamagnetic Substance 
2
Ferromagnetic Substance 
3
Paramagnetic Substance 
4
None of the above Substance 
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