The diagram shows a cell of negligible internal resistance connected to a switch and two resistors of resistances $R$ and $2R$.
The circuit also contains two ammeters X and Y.
The reading on X is 4.0A when the switch is open.
What are the readings on $X$ and $Y$ after the switch is closed?
1 )
A
2 )
B
C
4 )
D
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