Question

the charge that flows through the cell on closing the key k as shown in circuit is

correct ans is CV/4 But how please solve​

Answer 1

The charge that flows through the cell on closing the key k as shown in circuit is CV/4

1. When the key is open then charge will flow through all the cell
2. Finding the equivalent of all cells
3. the cells are in series so there equivalent is  C+C+C=3C
4. then the combination of 3 cell is in series with C
5. so  $Ceq= \frac{C X 3C}{C+3C} =3C/4$
6. the charge flowing is q = Ceq x V = 3CV/4
7. Now when the key is closed charge is passing through only one cell C$q^{'} = CV$
8. the charge that flows through the cell on closing the key k as shown in circuit is  CV-3CV/4=CV/4