Figure given in the question is a cross sectional view of a coaxial cable.The centre conductor is surrounded by a rubber layer,which is surrounded by an outer conductor,which is surrounded by another rubber layer.The current in the inner conductor is 1.0 A out of the page,and the current in the outer conductor is 3.0 A into the page.Determine the magnitude and direction of the magnetic field at points a and b.
![215544_fe182c921d36493ab8dd67f6ab603c29.png](https://search-static.byjusweb.com/question-images/toppr_invalid/questions/215544_fe182c921d36493ab8dd67f6ab603c29.png)