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Four identical long solenoids A, B, C and D are connected to each other as shown in the figure. If the magnetic field at the centre of A is 3 T, the field at the centre of C would be (Assume that the magnetic field is confined within the volume of respective solenoid)

Asked in JEE Main 18th March 1st Shift 2021 · Solenoid, toroid and field energy

Figure: Solenoid, toroid and field energy
Answer: (3) 1 T

Step-by-step solution

A carries i, which splits equally into the three identical solenoids B, C, D in parallel: i/3 each.

B=μ₀ n I∝ I

B_C=3/3=1 T

Why the other options are wrong

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