An infinitely long uniform solid wire of radius $a$ carries a uniform dc current of density $\overrightarrow{j}$.

A hole of radius $b$ (b < a) ia now drilled along the length of the wire at a distance $d$ from the center of the wire as shown below.

The magnetic field inside the hole is

1. uniform and depends only on $d$
2. uniform and depends only on $b$
3. uniform and depends only on both $b$ and $d$
4. non uniform
in Others
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