In the circuit shown, the current through the 4$\Omega$ resistor is 1 amp when the points P and M are connected to a D.C. voltage source. The potential difference between the points M and N is <br>

Question

https://clay6.com/mpaimg/238_a.jpg

( A ) 0.5 volt
( B ) 1.0 volt
( C ) 1.5 volt
( D ) 3.2 volt