A student performs an experiment to study the magnetic effect of current around a current-carrying straight conductor. He reports that:
(i) the direction of deflection of the north pole of a compass needle kept at a given point near the conductor remains unaffected even when the terminals of the battery sending the current in the wire are interchanged.
(ii) For a given battery current, the degree of deflection of a N-pole decreases when the compass is kept at a point farther away from the conductor.
Which of the above observations is correct and why?

Explanation

(ii) observations is correct, magnetic field decreases with increase in the radius around the conductor.
Decreases in magnetic field when going away from the conductor.