Question

Explain the magnetic field pattern in a straight current carrying wire

Answer 1

The direction of the magnetic field lines of force around a conductor is given by the Maxwell's right hand grip rule or the right handed corkscrew rule.​ ​Imagine that you are holding a current-carrying straight conductor in your right hand such that the thumb points towards the direction of current.

Answer 2

magnetic field direction across the current carrying wire should be accross that wire because the current should be perpendicular to magnetic field