The law of conservation of charge states that charges cannot be created or destroyed, so if one object loses electrons, another must pick them up. There are three methods to charge an object: friction, conduction, and induction. Friction occurs when two objects rub together and electrons are transferred from one to the other. Conduction happens through direct contact or touch, allowing the transfer of charges. Induction occurs when objects are close enough to each other but not quite touching. Examples of charges being transferred through these methods include a girl getting static electricity by touching a sphere, a comb rubbing against hair to create a static charge, a rod with positive charges near but not quite touching a metal ball, a rubber piece being rubbed with fur to create a negative charge, and a balloon being near a wall but not touching it. Saran wrap is also able to cling to food containers due to friction. The video shows examples of friction, conduction, and induction, such as a Van de Graaff generator charging by friction, people getting charged by conduction through touching a machine, and a trashcan being charged by induction due to its close proximity to Mr. Bean. Finally, Mr. Bean and a security guard shaking hands is an example of conduction as they are in direct contact.
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What would two negatively charged objects do when close together?