A steady current I flows along an infinitely long hollow cy…

Maths JEE - Advanced Previous Year Paper JEE-Advanced-2013-Paper-2 Single Correct MCQ

Published on: August 14, 2026

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.

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The correct answer is:

CHECK THE SOLUTION.

(A, D)

Due to field of solenoid is non zero in region 0 < r < R and non zero in region r>2R due to conductor.

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