A long thick conductor, radius R, carries a current of 4A into the page. Another

Question

A long thick conductor, radius R, carries a current of 4A into the page. Another conductor is coaxial to the first one, with a gap in between. The second conductor has inner radius 2R and outer radius 3R. It carries a current of 2A also into the page. What statement is true, considering measuring the magnetic field at points R < r < 2R, 2R < r < 3R and finally r > 3R   

R < r < 2R field falls like 1/r; increases going from 2R to 3R; zero when r > 3R

R < r < 2R field falls like 1/r; decreases going from 2R to 3R; falls off like 1/r when r > 3R

R < r < 2R field falls like 1/r; increases going from 2R to 3R; falls off like 1/r when r > 3R

R < r < 2R field falls like 1/r; increases going from 2R to 3R; increases proportional to r when r > 3R

R < r < 2R field falls like 1/r; increases going from 2R to 3R; zero when r > 3R

R < r < 2R field falls like 1/r; decreases going from 2R to 3R; falls off like 1/r when r > 3R

R < r < 2R field falls like 1/r; increases going from 2R to 3R; falls off like 1/r when r > 3R

R < r < 2R field falls like 1/r; increases going from 2R to 3R; increases proportional to r when r > 3R

Explanation / Answer

option A is true

R<r<2R filed fails like 1/r increases going from 2R to 3R zero where r>3R

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