A combination of capacitors given is charged by a cell of emf E as shown :
If it is given that `V_(ab)` i.e. potential difference between points a and b is 4V, then answer the given questions.
EMF E of the charging battery is:

Options

A. 46 V
B. 12 V
C. 20 V
D. 18 V

Answer

A

Explanation

We can consider the given circuit as:
Charge on `5muF` capacitor `=120muC " "therefore V_(c)-V_(e)=(120)/(5)=24V`
By applying kirchoff's law in shown loop, `E=12+10+24=46V`