# Guess why Cylindrical Shell wants To contract it's surface?

**Electricity and Magnetism**Level 4

A very long thin cylindrical shell of radius \(R\) carries uniform ucrrent \(I_0\) along its length. Calculate the pressure on the wall of the cylindrical shell due to the magnetic force.

**Details and Assumptions**:

- \(I_0 = \sqrt{\pi} \times 10 \text{ Ampere} \).
- \(R = 1\text{ mm} \).
- \( \pi = 3.14 \).