A potentiometer is used for the comparison of e.m.f. of two cells \( E_{1} \) and \( E_{2} \). F...

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A potentiometer is used for the comparison of e.m.f. of two cells \( E_{1} \) and \( E_{2} \). For cell \( E_{1} \) the no deflection point is obtained at \( 20 \mathrm{~cm} \) and for \( E_{2} \) the no deflection point is obtained at \( 30 \mathrm{~cm} \). The ratio of their e.m.f.'s will be
(A) \( 2 / 3 \)
(B) \( 1 / 2 \)
(C) 1
(D) 2
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