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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A coaxial cable consists of a thin inner conductor fixed along the axis of a hollow outer conductor. The two conductor carry equal currents in opposite directions. Let B1andB2 be the magnetic fields in the region between the conductors and outside the conductor, respectively. Then,

A coaxial cable consists of a thin inner conductor fixed along the axis of a hollow outer conductor. The two conductor carry equal currents in opposite directions. Let B1andB2 be the magnetic fields in the region between the conductors and outside the conductor, respectively. Then,

Figure shows three cases: in all cases the circular part has radius r and straight one are infinetly long. For the same current the ratio of field B at centre P in the three cases B1 ; B2 : B3 is