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In the circuit shown, the current through the $4 \Omega$ resistor is $1 \mathrm{amp}$ when the points $P$ and $\mathrm{M}$ are connected to a d.c. voltage source. The potential difference between the points $M$ and $N$ is
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3.2 volt
Potential difference between $P$ and $M=1 \times 4=4$ volt
Potential drop between points $M$ and $N=\frac{4 \times 1}{1+0.25}=3.2 \mathrm{~V}$
Potential drop between points $M$ and $N=\frac{4 \times 1}{1+0.25}=3.2 \mathrm{~V}$
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