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NEET2008PhysicsCurrent ElectricityActual

In the circuit shown, the current through the 4 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

Options

  1. A1.5 ~V
  2. B1.0 ~V
  3. C0.5 ~V
  4. D3.2 ~V

Correct answer

D. 3.2 ~V

Step-by-step solution

Key Idea : In parallel resistances, potential difference across them is same. Potential difference across PM V=4 1=4 volt (ie, across 4 ) Equivalent resistance of lower side arm, R_ e q =1+ 0.5 0.5 0.5+0.5 =1.25 Now the circuit can be shown as Let current I flows in lower branch, so aligned 1.25 I & =4 ~V I & = 4 1.25 =3.2 ~A aligned Therefore, 3.2 A current flows in 1 resistance, hence potential difference between M and N is V^ =3.2 1=3.2 volt

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