Hi please help me with the above attached problem on how to solve it!Please help!DETAILED EXPLANATION WOULD BE BETTER!🙏🙏

Four long co-axial thin walled cylindrical conductor A, B, C and D have radii R. 2R 3R and 4R respectively. A and C carry current I and 31 respectively to plane of paper on the other hand, B and D carry and 41 respectively outward to plane of paper. Then 21

I need solution of these questions.............................Magnetic effect of current

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Derive the relation between magnetic field intensity (H) and magnetization (M) for a magnetic material placed in a magnetizing field.