Resistors X and Y are connected in series with a 6.0 V battery of negligible internal resistance.
X has resistance R and Y has resistance $\frac{R}{2}$.
A voltmeter of resistance R is connected across Y.
What is the reading on the voltmeter?
 
            1 )
0.0 V
1.5 V
3 )
3.0 V
4 )
4.5 V
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