Hachures: - Hachures are short lines drawn to represent slope direction. - They are drawn perpendicular to contour lines and indicate steepness with thicker and closely spaced lines.
Hill Shading: - Hill shading uses light and shadow effects to give a three-dimensional appearance to hills. - It visually represents the shape of landforms by adding shades on one side and light on the other.
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.)