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NEETPhysicsMagnetic Effects of Current

Figure shows a long straight wire of a circular cross-section (radius a) carrying steady current I. The current I is uniformly distributed across this cross-section. Calculate the magnetic field in the region r > a

Options

  1. AB~=~ ( ₀ I 2 a ² )4r
  2. BB~=~ ( ₀ I 2 a ² )3r
  3. CB~=~ ( ₀ I 2 a ² )r
  4. DB~=~ ( ₀ I 2 a ² )2r

Correct answer

C. B~=~ ( ₀ I 2 a ² )r

Step-by-step solution

Correct Option is : (C) B~=~ ( ₀ I 2 a ² )r

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