AP EAMCET201823 Apr 2018Evening ShiftPhysicsMagnetic Effects of CurrentActual
Two long straight parallel conductors are carrying currents i₁ and i₂ in the same direction. Work done per unit length, when the distance between them is doubled is
Options
- A2 ₀ 2 i₁ i₂
- B₀ 2 i₁ i₂ [2]
- C₀ 2 i₁ i₂ [4]
- D0
Correct answer
B. ₀ 2 i₁ i₂ [2]
Step-by-step solution
aligned Work done & = _d^ 2 d F d x= _d^ 2 d ₀ i₁ i₂ 2 x d x & = ₀ i₁ i₂ 2 [ _e x ]_d^ 2 d = ₀ i₁ i₂ 2 ( _e 2 ) aligned