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NEET2019PhysicsMagnetic Effects of CurrentActual

Two parallel infinitely long current carrying wires are shown in figure. If resultant magnetic field at point P is zero. Then determine current I .

Options

  1. A50 ~A
  2. B15 ~A
  3. C30 ~A
  4. D25 ~A

Correct answer

C. 30 ~A

Step-by-step solution

At point P, B₁+B₂=0 aligned & ₀ I₁ 2 r₁ = ₀ I₂ 2 r₂ & I 27 = 10 9 , I=30 ~A aligned

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