Four identical long solenoids A, B, C and D


Four identical long solenoids $\mathrm{A}, \mathrm{B}, \mathrm{C}$ and $\mathrm{D}$ are connected to each other as shown in the figure. If the magnetic field at the center of $\mathrm{A}$ is $3 \mathrm{~T}$ the field at the center of $\mathrm{C}$ would be : (Assume that the magnetic field is confined with in the volume of respective solenoid).

  1. (1) $12 \mathrm{~T}$

  2. (2) $6 \mathrm{~T}$

  3. (3) $9 \mathrm{~T}$

  4. (4) $1 \mathrm{~T}$

Correct Option: , 4



$\phi \propto \mathrm{i}$

$\Rightarrow \mathbf{B} \propto \mathrm{i}$

so, field at centre of $\mathrm{C}=\frac{3}{3}=1 \mathrm{~T}$

Leave a comment


Click here to get exam-ready with eSaral

For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.

Download Now