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JEE Main201912 Jan 2019Morning ShiftPhysicsAlternating CurrentActual

In the figure shown, a circuit contains two identical resistors with resistance R = 5   Ω and an inductance with L = 2   m H . An ideal battery of 15 V is connected in the circuit. What will be the current through the battery long after the switch is closed?

Options

  1. A5.5 A
  2. B6 A
  3. C3 A
  4. D7.5 A

Correct answer

B. 6 A

Step-by-step solution

After a long time, when the growth of current in the circuit has stopped, the inductor will work as a conductor. Therefore the effective resistance of the circuit will be, R = 5 2 = 2 . 5   Ω Hence, the current through the circuit will be, I = V R = 15 2.5 = 6 A

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