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Current Electricity question

2009 · Q131
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Current Electricity question

2009 · Q131

NEETPhysicsCurrent ElectricityMCQ+4 / −1
See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it ?

AIPMT 2009 Physics - Current Electricity Question 79 English
  1. A
    ε2−i2r2−ε1−i1r1=0{\varepsilon _2} - {i_2}{r_2} - {\varepsilon _1} - {i_1}{r_1} = 0ε2​−i2​r2​−ε1​−i1​r1​=0
  2. B
    −ε2−(i1+i2)R+i2r2=0- {\varepsilon _2} - \left( {{i_1} + {i_2}} \right)R + {i_2}{r_2} = 0−ε2​−(i1​+i2​)R+i2​r2​=0
  3. C
    ε1−(i1+i2)R+i1r1=0{\varepsilon _1} - \left( {{i_1} + {i_2}} \right)R + {i_1}{r_1} = 0ε1​−(i1​+i2​)R+i1​r1​=0
  4. D
    ε1−(i1+i2)R−i1r1=0{\varepsilon _1} - \left( {{i_1} + {i_2}} \right)R - {i_1}{r_1} = 0ε1​−(i1​+i2​)R−i1​r1​=0
View written solutionFree

Correct answer: D

AIPMT 2009 Physics - Current Electricity Question 79 English Explanation

Applying Kirchhoff’s equation to the loop ABFE,

– (i1 + i2)R – i1r1 + ε1{\varepsilon _1}ε1​ = 0

⇒\Rightarrow⇒ ε1{\varepsilon _1}ε1​ – (i1 + i2)R – i1r1 = 0

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