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Magnetism question

2013 · Shift 2 · Q48
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Magnetism question

2013 · Shift 2 · Q48

JEE AdvancedPhysicsMagnetismMultiple correct+4 / −2
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)
  1. A
    In the region 0 < r < R, the magnetic field is non-zero.
  2. B
    In the region R < r < 2R, the magnetic field is along the common axis.
  3. C
    In the region R < r < 2R, the magnetic field is tangential to the circle of radius r, centred on the axis.
  4. D
    In the region r > 2R, the magnetic field is non-zero.
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