Question

3) Consider an infinitely long current carrying cylindrical straight wire having radius 'a'. Consider two points A and B, one inside the wire (point A) and the other outside the wire (point B) at a distance of rl and r2 from the axis. If at both A and B the magnetic field is one-third of that at the surface of the wire, then find the ratio of rl and r2.
A) 1/3
B) 1/6
C) 1/9
D) 1/12

Answer 1

Answer:

1/12 is the correct answer............

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