Question 69 of 276

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).

A$12T$B$6T$C$9T$D$1T$

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Answer: (D) $1T$

$\phi \propto i$$\Rightarrow B\propto i$, so, the field at the center of $C=\dfrac{3}{3}=1T$.