Two cells \( \varepsilon_{1} \) and \( \varepsilon_{2} \) connected in opposition to each other ...

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Two cells \( \varepsilon_{1} \) and \( \varepsilon_{2} \) connected in opposition to each other as shown in figure. The cell \( \varepsilon_{1} \) is of emf \( 9 \mathrm{~V} \) and internal resistance \( 3 \Omega \) the cell \( \varepsilon_{2} \) is of emf \( 7 \mathrm{~V} \) and internal resistance \( 7 \Omega \). The potential difference between the points \( A \) and \( B \) is
img src=https://penpencil-static-content.s3.ap-south-1.amazonaws.com/5eb393ee95fab7468a79d189/ua750dn7k5yco1kdm3im6ediy.png /
(a) \( 8.4 \mathrm{~V} \)
(b) \( 5.6 \mathrm{~V} \)
(c) \( 7.8 \mathrm{~V} \)
(d) \( 6.6 \mathrm{~V} \)
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