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I have following two circuits. In 1st circuit(figure 1.a), I can join ground terminal of R2 with node D,so that current can flow as in loop A-B-D-E-A and loop B-C-D-B.

But I am confused with figure 1.b. In this circuit, current can flow in loop as M-N-S-T-M but I don't understand can there be current flow in the loop O-P-Q-R-O or not?

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    \$\begingroup\$ no , it's floating at V(N) \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Sep 23 '16 at 6:20
  • \$\begingroup\$ no, the voltages at O,P,Q and R are all the same (= N = +V). Without any voltage difference there is no current. \$\endgroup\$ – JIm Dearden Sep 23 '16 at 9:04
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All the current from V must flow through R1, so effectively no current will flow through the second loop.

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