How could the strength of an electromagnet be increased? by reducing the length of the core (nail) of the electromagnet

by using the rubber material as the core for the electromagnet

by decreasing the amount batteries used for the electromagnet

by increasing the number of coils in the wires of the electromagnet.

Freezing and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.