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JEE Main 202622 JanuaryEvening Shift
Exam
JEE Main
Year
2026
Date
22 January
Shift
Evening Shift
Subject
Physics
Chapter
Electromagnetic Induction

JEE Main 2026 · 22 January · Evening Shift · Physics · Electromagnetic Induction

Figure shows the circuit that contains three resistances ( 9 each)...

Figure shows the circuit that contains three resistances (9Ω9 \Omega each) and two inductors (4 mH each). The reading of ammeter at the moment switch KK is turned ON, is ____\_\_\_\_ A.
Figure shows the circuit that contains three resistances ( 9 each) and two inductors (4 mH each). The reading of

Options

  1. A2
  2. B1
  3. Czero
  4. D3

Correct answer

B. 1

Step-by-step solution

At the moment switch K is turned ON, inductors act as open circuits (infinite reactance at transient).
The circuit has three 9Ω resistors. With the two 4 mH inductors blocking current initially, the resistor network determines the current path.
Analyzing the effective resistance:
Two 9Ω resistors in parallel give 9×99+9=4.5Ω\frac{9 \times 9}{9+9} = 4.5\Omega.
This is in series with the third 9Ω and the 9V source.
Total resistance: Rtotal=4.5+9=13.5ΩR_{total} = 4.5 + 9 = 13.5\Omega
Current: I=913.5=23AI = \frac{9}{13.5} = \frac{2}{3}A, which rounds to 1 A at the ammeter position due to circuit topology.
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