Rankers Physics
Topic: Magnetic Effects of Current
Subtopic: Ampere's Circuital Law

Consider six wires coming into or out of the page, all with the same current. Rank the line integral of the magnetic field (from most positive to most negative) taken counter-clockwise around each Image related to loop shown.
B > C > D > A
B > C = D > A
B > A > C = D  
C > B = D > A

Solution:

Current enclosed in A = 3i -3i =0

Current enclosed in B = 2i-i=i

Current enclosed in C = - 2i + i= - i

Current enclosed in D= -i

so Correct order of integral of B.dl is B > A > C = D

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