Q121 / 180 · NEET 2017 · Physics

Figure shows a circuit contains three identical resistors with resistance R=9.0 Ω each, two identical inductors with inductance L=2.0  mH each, and an ideal battery with emf ε= 18 V. The current i through the battery just after the switch closed is:

Figure

  • A
    2  mA
  • B
    0.2 A
  • Correct answer
    C
    2 A
  • D
    0 A

Solution

When the switch is just closed, the inductors show infinite opposition and hence both the branches with Inductor-Resistor combination do not really participate in the circuit.

Figure

At t=0 , no current flows through R1 and R3

At t=0 inductor behaves like an open wire.
   Figure
i=εR2
=189
=2 A

Hence, the correct answer is option: 'C'.

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