The methods of judging distance include:
Explanation: Unit of Measure Method
In this method, distance is judged using a known unit of measurement such as meters or steps. The observer estimates how many units of the known measure would fit between the observer and the target.
Draw the pattern of the magnetic field lines for the two parallel straight conductors carrying current of same magnitude 'I' in opposite directions as shown. Show the direction of magnetic field at a point O which is equidistant from the two conductors. (Consider that the conductors are inserted normal to the plane of a rectangular cardboard.)