A coaxial cable consists of a thin inner conductor fixed along the axis of a hollow outer conductor. The two conductors carry equal currents in opposite directions. Let B1 and B2 be the magnetic fields in the region between the conductors and outside the conductor, respectively. Then,

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B1≠0, B2≠0

B1=B2=0

B1≠0, B2=0

B1=0, B2≠0

answer is C.

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Detailed Solution

Apply Ampere's Circuital Law for loop L1 and L2.

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