A student made the table shown to list some contact and non-contact forces. Examples of Forces
Contact ForcesNon-Contact Forces
The force applied by a magnet on an iron nailThe force applied by an electromagnet on a wire
The force applied by a student on a door to open itThe force applied by the planets on each other

Which statement best explains why the table is incorrect?
Magnetic force is a force acting at a distance.
The student applies a non-contact force on the door.
Electromagnets use contact force.
Gravitational force acts between planets only when they are in contact.