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## Main Question or Discussion Point

So i was doing a question from Irodov(Q 3.238) & got stuck for hours (as expected)

The question goes -

A thin conducting strip of width h is tightly wound in the shape of a very long coil with cross-section radius R to make a single layer straight solenoid. A direct current I flows through the strip. Find the magnetic induction inside and outside the solenoid as a function of the distance r from its axis.

After looking at the solution, it said that current will flow

I don't understand this. Why is it necessary that current will flow obliquely & not along the length?

And if this is the case, then current should flow obliquely in all 2-D objects.

Also, I would like to know how do we determine this kind of current distribution(like in 3-D & other 2-D objects).

The question goes -

A thin conducting strip of width h is tightly wound in the shape of a very long coil with cross-section radius R to make a single layer straight solenoid. A direct current I flows through the strip. Find the magnetic induction inside and outside the solenoid as a function of the distance r from its axis.

After looking at the solution, it said that current will flow

**obliquely**in the strip i.e. current density will have two perpendicular components.I don't understand this. Why is it necessary that current will flow obliquely & not along the length?

And if this is the case, then current should flow obliquely in all 2-D objects.

Also, I would like to know how do we determine this kind of current distribution(like in 3-D & other 2-D objects).