The figure shows the cross-section of two long coaxial tubes carrying equal currents I in opposit...

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The figure shows the cross-section of two long coaxial tubes carrying equal currents I in opposite directions. If B_1 and B_2 are magnetic fields at points 1 and 2 , as shown in figure-4.207 then :
Figure 4.207
(A) B_1≠ 0 ; B_2=0
(B) B_1=0 ; B_2=0
(C) B_1≠ 0 ; B_2≠ 0
(D) B_1=0 ; B_2≠ 0

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