Draw the pattern of magnetic field lines around a current carrying strainght conductor. How does the strength of the magnetic field produced change.
(i) with the distance from the conductor ?
(ii) with increase in current in a conductor ?

Explanation

(i) Strength of the magnetic field produced by a straight current carrying wire at a point is inversely proportional to the distance of that point from the wire.
(ii) Strength of the magnetic field is directly proportional to the current passing in the wire.