A steady current I flows along an infinitely long hollow cylindrical conductor of radius…
Physics · JEE Advanced · NTA Exams — Magnetic Effects of Current and Magnetism
A steady current I flows 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 P at a distance r from the common axis. The correct statement(s) is (are).
- In the region 0 < r < R, the magnetic field is non-zero.
- In the region R < r < 2R, the magnetic field is along the common axis.
- In the region R < r < 2R, the magnetic field is tangential to the circle of radius r, centered on the axis.
- In the region r > 2R, the magnetic field is non-zero.
Answer
(C) In the region R R , the magnetic field is tangential to the circle of radius r , centered on the axis.
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