Measuring tape is used to measure the distance covered during a long jump. It ensures accurate measurement from the take-off point to the landing point in the sandpit.
- Option (a): A stopwatch measures time, not distance.
- Option (b): A height chart measures height, not horizontal distance.
- Option (d): A weighing scale measures weight.
Thus, the correct equipment for measuring long jump is a measuring tape.
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.)