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NEET2008PhysicsMagnetic Effects of CurrentActual

A closed loop PQRS carrying a current is placed in a uniform magnetic field. If the magnetic forces on segments P S, S R and R Q are F₁, F₂ and F₃ respectively and are in the plane of the paper and along the directions shown, the directions shown, the force on the segment Q P is

Options

  1. AF₃-F₁-F₂
  2. B(F₃-F₁ )^2+F₂^2
  3. C(F₃-F₁ )^2-F₂^2
  4. DF₃-F₁+F₂

Correct answer

B. (F₃-F₁ )^2+F₂^2

Step-by-step solution

( aligned & F₄ =F₂ & F₄ = (F₃-F₁ ) & F₄= (F₃-F₁ )^2+F₂^2 aligned ) For a closed loop there is no translation.

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