The diagram represents a cell with negligible internal resistance joined to a switch and two resistors with resistances $R$ and $2R$. The circuit also includes two ammeters X and Y. When the switch is open, the reading on X is $4.0\,\text{A}$. What readings are shown on X and Y once the switch has been closed?
- Areading on X: $4.0\,\text{A}$, reading on Y: $1.3\,\text{A}$
- Breading on X: $4.0\,\text{A}$, reading on Y: $2.7\,\text{A}$
- Creading on X: $6.0\,\text{A}$, reading on Y: $2.0\,\text{A}$
- Dreading on X: $6.0\,\text{A}$, reading on Y: $4.0\,\text{A}$