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JEE Main202118 Mar 2021Morning ShiftPhysicsMagnetic Effects of CurrentActual

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 center of A is 3 T the field at the center of C would be : (Assume that the magnetic field is confined with in the volume of respective solenoid).

Options

  1. A12   T
  2. B6   T
  3. C9   T
  4. D1   T

Correct answer

D. 1   T

Step-by-step solution

ϕ ∝ i ⇒ B ∝ i , so, the field at the center of C = 3 3 = 1   T .

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