In the circuit shown, a battery of negligible internal resistance is connected in series with a pair of fixed resistors $R_1$ and $R_2$.
The circuit is to be used to test whether the electromotive force (e.m.f.) of a particular cell is $1.5V$. The cell is connected between terminals $X$ and $Y$ in parallel with $R_2$ and in series with a galvanometer.
Which statement about the test is correct?
1 )
Any non-zero reading on the galvanometer means the cell has an e.m.f. of $1.5V$.
2 )
The battery does not need to have an e.m.f. of $6.0V$.
3 )
The cell may be connected either way round between $X$ and $Y$.
The galvanometer does not need a scale calibrated in amperes.
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