Question

how does a source object exert a force on another object without touching it? it can only work if both objects are magnetic. it is surrounded by an invisible field of influence. it heats the air around the object, causing it to move. it sends out sound waves that push the object.

Explanation:

In physics, forces like gravitational, magnetic, and electric forces act at a distance. A field (e.g., magnetic field) is a region where a force can be exerted. The yellow card is wrong as non - magnetic objects can also experience forces (e.g., gravitational). The orange card is wrong as heating air isn't the general mechanism for force at a distance. The teal card is wrong as sound waves aren't the general cause for such forces. The purple card correctly refers to the concept of a field (invisible field of influence) which is a fundamental concept in physics for forces acting at a distance.

Answer:

Purple card (It is surrounded by an invisible field of influence)