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Q.

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

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a

1T

b

6T

c

12T

d

9T

answer is A.

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Detailed Solution

Current will be divided equally in three parts.Magnetic field in solenoid=B=μ0ni ⇒B ∝ i If current becomes one third, magnetic field also becomes one third.
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