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MHT CET202310 May 2023Evening ShiftPhysicsMagnetic Effects of CurrentActual

The magnetic field at the centre of a circular coil of radius ' R ', carrying current 2 ~A is ' B ₁ '. The magnetic field at the centre of another coil of radius ' 3 R ' carrying current 4 A is ' B₂ '. The ratio B₁: B₂ is

Options

  1. A1: 2
  2. B2: 1
  3. C2: 3
  4. D3: 2

Correct answer

D. 3: 2

Step-by-step solution

aligned B ₁ & = ₀ 4 2 2 R = ₀ R B ₂ & = ₀ 4 2 4 3 R = 2 ₀ 3 R B ₁ ~B ₂ & = ( ₀ R ) 2 ₀ (3 R ) = 3 2 aligned

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