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19. A long straight, hollow conducting tube carrying a current along +ve y-axis as shown in the figure. The line PQ is parallel to positive y- axis. The magnetic field at 1, 2, 3 and 4 is B1, B2, B3 and B (respectively). Then (A) B3> B2> B1> B4 (B) B1 > B2 > B3 > B4 3x R/4
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2 3 uring amber eo law 2773 ve see ure aul nb 1,2, 3 4 右 yo 2 o

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