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Free PDF download of Important Questions with Answers for CBSE Class 12 Physics Chapter 4 - Moving Charges and Magnetism prepared by expert Physics teachers from latest edition of CBSE(NCERT) books. (d) flux density increases (b) 4 (c) spin of nucleus Ans: d, 70. (a) iron Check the below NCERT MCQ Questions for Class 12 Physics Chapter 4 Moving Charges and Magnetism with Answers Pdf free download. (a) reluctance of conductor The materials having low retentivity are suitable for making (b) Paramagnetic It attracts some metals. 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