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A steady current I flow along an infinitely long hollow cylindrical conductor of radius R. This cylinder is placed coaxially inside an infinite solenoid of radius 2R. The solenoid has n turns per unit length and carries a steady current I. Consider a point at a distance r from the common axis. The correct statement(s) is (are):
A) In the region r is between 0 and R, the magnetic field is non-zero.
B) In the region r is between R and 2R, the magnetic field is along the common axis.
C) In the region r is between R and 2R, the magnetic field is tangential to the circle of radius r, centered on the axis.
D) In the region r is greater than R, the magnetic field is non-zero.

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