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JEE Main2004PhysicsMagnetic Effects of CurrentActual

Two long conductors, separated by a distance d carry current I ₁ and I ₂ in the same direction. They exert a force F on each other. Now the current in one of them increased to two times and its direction reversed. The distance is also increased to 3 ~d . The new value of the force between them is

Options

  1. A-2 ~F
  2. BF / 3
  3. C-2 F / 3
  4. D- F / 3

Correct answer

C. -2 F / 3

Step-by-step solution

Force between two long conductor carrying current F= ₀ 2 l₁ l₂ d According to question F^ = ₀ 2 (-2 I₁ ) (I₂ ) d From equation (i) and (ii), F ^ =- 3 2 ~F .

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