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AP EAMCET202422 May 2024Morning ShiftPhysicsMagnetic Effects of CurrentActual

Two toroids with number of turns 400 and 200 have arrange radii respectively 30 cm and 60 cm . If they carry the same current, the ratio of magnetic fields in these two toroids is

Options

  1. A2:1
  2. B1:4
  3. C2:3
  4. D4:1

Correct answer

D. 4:1

Step-by-step solution

For toroid, magnetic field inside it is aligned & B= ₀ ( N 2 R ) I B N R & B₁ B₂ = ( N₁ N₂ )= 400 200 60 30 =4: 1 aligned

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