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KCET2019PhysicsMagnetic Effects of Current

The magnetic field at the centre ' ( O ) ' in the given figure is

Options

  1. A( 3 10 ₀ I )
  2. B( 7 14 ₀ I )
  3. C( ₀ I 12 R )
  4. D( 5 12 ₀ I R )

Correct answer

D. ( 5 12 ₀ I R )

Step-by-step solution

(D) Here ( =300^ ) ( ) Number of turns ( n= 300 360 = 5 6 ) ( B= ₀ n I 2 R ) i.e., ( ₀ 5 6 I 2 R ) ( B= 5 ₀ I 12 R )

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