A combination of capacitors given is charged by a cell of emf \( E \) as shown: If it is given t...

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A combination of capacitors given is charged by a cell of emf \( E \) as shown:
If it is given that \( V_{a b} \), i.e. potential difference between points \( a \) and \( b \) is \( 4 V \), then answer the given questions.
EMF \( E \) of the charging battery is
(a) \( 46 \mathrm{~V} \)
(b) \( 12 \mathrm{~V} \)
(c) \( 20 \mathrm{~V} \)
(d) \( 18 \mathrm{~V} \)
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