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PhysicsJEE Main 2 Apr 2026, Shift 1·Q14·MCQ·Moderate

Moving Charges and Magnetism · Sources of magnetic field

Two identical long current carrying wires are bent into the shapes shown in the following figures. If the magnitude of magnetic fields at the centres P and Q of a semicircular arc are B1B_1 and B2B_2 respectively, then the ratio B1B2\dfrac{B_1}{B_2} is .
  1. (1)2+π1+π\dfrac{2+\pi}{1+\pi}
  2. (2)1+π1−π\dfrac{1+\pi}{1-\pi}
  3. (3)2+π1−π\dfrac{2+\pi}{1-\pi}
  4. (4)1+π2−π\dfrac{1+\pi}{2-\pi}

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