Two current loops are positioned around the same center point P. The inner loop has radius r1r1 = 9 cmcm and current I1I1 = 2.5 AA , the outer loop has radius r2r2 = 11 cmcm and current I2I2 = -1.5 AA . What is the B field at the center point P?
Note: a positive current denotes counter-clockwise flow, and a negative current denotes clockwise flow.
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