Current Electricity - Result Question 48

51. See the electric circuit shown in the figure.

Which of the following equations is a correct equation for it?

[2009]

(a) $\varepsilon_2-i_2 r_2-\varepsilon_1-i_1 r_1=0$

(b) $-\varepsilon_2-(i_1+i_2) R+i_2 r_2=0$

(c) $\varepsilon_1-(i_1+i_2) R+i_1 r_1=0$

(d) $\varepsilon_1-(i_1+i_2) R-i_1 r_1=0$

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Answer:

Correct Answer: 51. (d)

Solution:

  1. (d)

Applying Kirchhoff’s rule in loop abcfa $\varepsilon_1-(i_1+i_2) R-i_1 r_1=0$.