आधुनिक शक्तिशाली चुम्बक किससे बनते है? - Study24x7
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Gajendra Rathore
15 Jan 2020 10:26 AM study24x7 study24x7

आधुनिक शक्तिशाली चुम्बक किससे बनते है?

A

लौह-यौगिकों से

B

लौह-चुम्बकीय पदार्थों से

C

 एल्युमिनियम, कोबाल्ट एवं निकेल की मिश्र-धातुओं से

D

लोहा, कोबाल्ट एवं निकेल की मिश्र-धातुओं से

SSC
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