Braddy connected the lose wire to the battery and created an electromagnet. he picked up 45 thumb tacks with his electromagnet, though his goal was to pick up 50 thumb tacks. what could braddy do to increase the strength of his electromagnet and pick up more thumbtacks? a) use fewer coils of wire. b) use a screw instead of a nail. c) use two batteries instead of one. d) replace the nail with a piece of steel.

Braddy could use two batteries instead of one.  One way he could increase the strength of his magnet is to increase the current and add a second battery. He could also add more coils of wire, not use fewer.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.