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MCQEasyJEE Main 2025 · 24 January, Shift 2Ampere's Law

Physics Question from JEE Main 2025 · 24 January, Shift 2

A long straight wire of a circular cross-section with radius aa carries a steady current II. The current is uniformly distributed across this cross-section. The plot of magnitude of magnetic field BB with distance rr from the centre of the wire is given by:

  • A

    Plot 1:

    Graph of magnetic field B versus distance r showing constant magnetic field inside the wire up to radius a, then decreasing outside the wire.
  • B

    Plot 2:

    Graph of magnetic field B versus distance r rising linearly from the center to radius a, then decreasing smoothly outside the wire.
  • C

    Plot 3:

    Graph of magnetic field B versus distance r starting from a finite value B0 at the center and decreasing continuously, marked with B0 over e at radius a.
  • D

    Plot 4:

    Graph of magnetic field B versus distance r showing zero field inside the wire, a sudden jump at radius a, then decreasing outside the wire.

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