Q.

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

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a

ε1− i1+i2 R−i1r1 =0

b

ε2−( i1+i2 )R−ε1−i1r1 =0

c

-ε2− i1+i2 R+i2r2 =0

d

ε1− i1+i2 R+i1r1 =0

answer is A.

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Detailed Solution

Apply Kirchhoff's second law, also called loop rule. The algebraic sum of the changes in potential in complete transversal of a mesh (closed loop) is zero. ie, ∑V=0Here  ε1− i1+i2 R−i1r1 =0
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