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JEE Main202628 January 2026Evening ShiftPhysicsMagnetic Effects of CurrentActual

A long cylindrical conductor with large cross section carries an electric current distributed uniformly over its cross-section. Magnetic field due to this current is : A. maximum at either ends of the conductor and minimum at the midpoint B. maximum at the axis of the conductor C. minimum at the surface of the conductor D. minimum at the axis of the conductor E. same at all points in the cross-section of the conducto

Options

  1. AA, D Only
  2. BD Only
  3. CE Only
  4. DB, C Only

Correct answer

B. D Only

Step-by-step solution

For a long cylindrical conductor with uniform current distribution, apply Ampere's law to find the magnetic field. At distance r from the axis (inside the conductor, r At the axis ( r = 0 ): B = 0 (minimum) At the surface ( r = R ): B = ₀ I 2 R (maximum) Analyzing the statements: A. Maximum at ends and minimum at midpoint - FALSE. This describes behavior along the axis, but the magnetic field depends on radial distance, not axial position. B. Maximum at the axis of the conductor - FALSE. The field is zero at the ax

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