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NEET2009PhysicsCurrent ElectricityActual

See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it?

Options

  1. A₁- ( i ₁+ i ₂ ) R - i ₁ r ₁=0
  2. B₂-i₂ r ₂- ₁-i₁ r ₁=0
  3. C- ₂- (i₁+i₂ ) R+i₂ r₂=0
  4. D₁- ( i ₁+ i ₂ ) R + i ₁ r ₁=0

Correct answer

A. ₁- ( i ₁+ i ₂ ) R - i ₁ r ₁=0

Step-by-step solution

Key Idea Apply Kirchhoff' second law also called loop rule. The algebraic sum of the changes in potential in complete transversal of a mesh (closed loop) is zero. i e, V =0 Here ₁- (i₁+i₂ ) R-i₁ r₁=0 If there are n meshes in a circuit, the number of independent equations in accordance with loop law will be (n-1) .

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