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Two cells of emf ε1 and ε22 < ε1 ) are joined as shown in figure :

When a potentiometer is connected between X and Y it balances for 300 cm length against ε1 . On connecting the same potentiometer between X and Z it balances for 100 cm length against ε1 and ε2 Then the ratio ε22 is :

 (A) 1/3

(B) 3/4

 (C) 1/4

(D) 2/3

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Correct option (D) 2/3


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