Question

what factors affect the strength of electric and magnetic forces between objects that are not in contact with each other? what evidence supports that fields exist between objects exerting forces on each other even though the objects are not in contact? watch the video clip. it shows an electromagnet lifting some metal. how do you think it works? how are these magnets different from regular magnets? what factors do you think affect the strength of electric and magnetic forces?

Explanation:

For the first question, factors include the amount of charge (for electric forces), the distance between objects (inverse - square relationship for both electric and magnetic forces), and the magnetic properties of materials (for magnetic forces). Evidence for the existence of fields between non - contacting objects includes the behavior of magnets attracting or repelling each other without contact, and charged objects influencing each other from a distance. An electromagnet works by passing an electric current through a coil of wire, creating a magnetic field. It differs from a regular magnet as its magnetic field can be turned on and off and its strength can be adjusted by changing the current or the number of coil turns. The factors affecting the strength of electric and magnetic forces are similar to those mentioned before, such as charge, distance, and magnetic properties.

Answer:

• Factors affecting electric and magnetic forces: Amount of charge, distance between objects, magnetic properties of materials.
• Evidence of fields: Behavior of non - contacting magnets and charged objects.
• How electromagnet works: Electric current through a coil creates a magnetic field.
• Difference from regular magnet: Can be turned on/off, strength adjustable.
• Factors affecting force strength: Charge, distance, magnetic properties.