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JEE Main20252 Apr 2025Morning ShiftPhysicsMagnetic Effects of CurrentActual

Let B₁ be the magnitude of magnetic field at center of a circular coil of radius R carrying current I . Let B₂ be the magnitude of magnetic field at an axial distance ' x ' from the center. For x: R=3: 4, B₂ B₁ is :

Options

  1. A4: 5
  2. B16: 25
  3. C64: 125
  4. D25: 16

Correct answer

C. 64: 125

Step-by-step solution

aligned & B ₁= ₀ i 2 R B ₂= B ₁ ^3 & ~B ₂ ~B ₁ = ^3 = ( 4 5 )^3= 64 125 aligned

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