Magnetic field due to a current carrying straight conductor cannot have cylinderical symmetry? true or false

The magnetic field around a current carrying straight conductor is in concentric circles with the center of circle at a point where the conductor is not located. Is this statement true.

The magnetic field at a point due to a current carrying conductor is directly proportional to

Draw the pattern of magnetic field lines around a current carrying straight conductor.How does the strength of magnetic field produce change with an increase in current in a conductor?

A student performs an experiment to study the magnetic effect of current around a current carrying straight conductor with the help of a magnetic compass. He reports that The direction of deflection of the magnetic compass increases when the current through the conductor is increased. Which of the above observations of the student appears to be wrong and why?