A. Does the magnet have to be touching the nail to lift the tack or paper clip? b. How close does it have to be? Experiment with different-sized magnets.
c. Does the size of the magnetic field change with the size of the magnet?

ANSWER ALL A, B, AND C.
Thank you.

As seen in a us weather map, the h (or high) and l (or low) symbols indicate regions where surface air pressures are high or low, respectively, compared to surrounding areas. an h is plotted where the air pressure is highest and an l is plotted where the air pressure is lowest. proceeding outward and away from the center of a high pressure system, the air pressure "