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JEE Main2015PhysicsCurrent ElectricityActual

In the circuit shown, the current in the 1 Ω resistor is:

Options

  1. A0 . 13   A , from P to Q
  2. B1 . 3   A , from P to Q
  3. C1 . 3   A , from Q to P
  4. D0 . 13   A , from Q to P

Correct answer

D. 0 . 13   A , from Q to P

Step-by-step solution

R = 3   Ω + 2   Ω . Let potential at P = 0 , ∴ V A = 6   V ,   V D = − 9   V , and V Q = x . Apply K.C.L. at x , x − 6 3 + x − 0 1 + x + 9 5 = 0 . Solving, x = 3 23     V . So, current in 1   Ω ⇒ i = 3 23 − 0 1 from Q to P ⇒ i = 0 . 13   A from Q to P

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