Four identical long solenoids A, B, C an...

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).

9 T

6 T

1 T

12 T

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