The reading of an ideal voltmer in the circuit shown is.....$V$
NEET 2019, Medium
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$\left(\mathrm{V}_{1}-\mathrm{V}_{2}\right)=\frac{30}{25}-\frac{20}{25}=\frac{10}{25}=\frac{2}{5}=0.4 \mathrm{V}$
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