The field around a long, straight wire is:
parallel to the wire
radial to the wire
perpendicular to the wire
concentric with the wire

Concentric with the wire

Explanation:

The magnetic field around a long, straight current-carrying wire forms concentric lines around the wire itself. The magnitude of the field is given by:

where

is the magnetic permeability

I is the current in the wire

r is the distance from the wire

The direction of the lines of the field can be determined by using the right-hand rule: the thumb of the right hand points in the same direction as the current, and the other fingers (wrapped around the thumb) gives the direction of the field lines.

choosing tennis and golf balls is your inde choice.

their mass and volume are dep

heat the gas and measure the pressure