Question

If the current in a wire is directed upward, what is the direction of the magnetic field produced by the current?

Answer 1

right hand rule

Answer 2

the image below is v important in physics. the curled fingers indicate the direction of the magnetic field, if the thumb indicates the direction of the current.

in mechanics, the thumb indicates the direction of the angular velocity or momentum if the curled fingers indicate the direction of rotation.

Answer 3

and as @caominhim rightly says, the relevant hand is the right hand.