Key Idea : In parallel resistances, potential difference across them is same. Potential difference across PM V=4×1=4 volt (ie, across 4Ω) Equivalent resistance of lower side arm, Req=1+0.5+0.50.5×0.5=1.25Ω Now the circuit can be shown as 
Let current I flows in lower branch, so 1.25II=4 V=1.254=3.2 A Therefore, 3.2 A current flows in 1Ω resistance, hence potential difference between M and N is V′=3.2×1=3.2 volt
NEET UG 2008 — Physics Electromagnetism
2008mcqmedium
In the circuit shown, the current through the 4Ω resistor is 1 A when the points P and M are connected to a DC voltage source. The potential difference between the points M and N is 
Official previous-year question
Held on 30 Apr 2008 · Verified 9 Jul 2026.
Options
- A
1.5 V
- B
1.0 V
- C
0.5 V
- D
3.2 V
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