The diagram shows a circuit consisting of a cell and three resistors $R_1$, $R_2$ and $R_3$.
The cell has electromotive force (e.m.f.) $1.60V$ and negligible internal resistance. The current in the cell is $0.64A$.
The potential difference across $R_1$ is $0.48V$.
The current in $R_3$ is $0.32A$.
What is the resistance of $R_2$?

1 )
$1.5 Ω$
2 )
$2.5 Ω$
$3.5 Ω$
4 )
$5.0 Ω$
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