AP Physics C: Electricity and Magnetism Flashcards: Conservation of Electric Charge and the Process of Charging
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
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Define the behavior of a system in terms of charge conservation.
The conservation of charge dictates that any change to a system's net charge results from a transfer of charge between the system and its surroundings.
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Define the behavior of a system in terms of charge conservation.
The conservation of charge dictates that any change to a system's net charge results from a transfer of charge between the system and its surroundings.
Why is a large object like the Earth used for grounding?
A large, approximately neutral system like the Earth is used because it can accept or donate charge during grounding without a significant change to its own overall neutral state.
Is it possible for a system's net charge to change without any charge being transferred?
No, it is not possible. Any change to a system's net charge must be due to a transfer of charge between the system and its surroundings.
How does the presence of one charged object affect another system without touching it?
The net charge or charge distribution of a system can change in response to the presence of, or changes in, the net charge of other systems.
A neutral object becomes positively charged. Based on the conservation of charge, what must have happened?
The object must have transferred negative charge to its surroundings, as a change in net charge is only possible through charge transfer.
If an object with a net negative charge is grounded, what happens to its excess charge?
The excess charge is transferred from the object to the much larger neutral system (e.g., Earth) it is connected to.
According to the principle of conservation of charge, what is the only way a system's net charge can be altered?
Any change to a system's net charge is due to a transfer of charge between the system and its surroundings.
What is grounding?
Grounding involves electrically connecting a charged object to a much larger and approximately neutral system, such as the Earth.
A charged rod is brought near a neutral conductor, causing the charges within the conductor to separate. What principle does this demonstrate?
This demonstrates that the charge distribution of a system can change in response to the presence of the net charge or charge distribution of other systems.
What is the role of the 'surroundings' when an object's net charge changes?
The surroundings act as the source or destination for charge that is transferred to or from the system, causing the change in the system's net charge.