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| 184_notes:charging_discharging [2020/08/17 16:35] – dmcpadden | 184_notes:charging_discharging [2021/01/25 00:22] – bartonmo |
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| If you touch the tape, your finger acts as a neutral conductor and the charges are able to move from the tape into your finger. Unfortunately, you cannot shock your friend using your finger because the charges then spread through your body and you are not adding enough charge compared to all the charges and atoms in your body to be able to notice. We call a vast collection of positive and negative charges **an electrical ground** or just **ground** (it is called ground because the Earth is typically used as an electrical ground). A ground is able to absorb small amounts of charge and remain neutral because the added charge is so small compared to the total number of charges in the ground. In the tape example, your body was acting as a ground. The symbol for a ground is three horizontal lines, decreasing in size (shown to the right). | If you touch the tape, your finger acts as a neutral conductor and the charges are able to move from the tape into your finger. Unfortunately, you cannot shock your friend using your finger because the charges then spread through your body and you are not adding enough charge compared to all the charges and atoms in your body to be able to notice. We call a vast collection of positive and negative charges **an electrical ground** or just **ground** (it is called ground because the Earth is typically used as an electrical ground). A ground is able to absorb small amounts of charge and remain neutral because the added charge is so small compared to the total number of charges in the ground. In the tape example, your body was acting as a ground. The symbol for a ground is three horizontal lines, decreasing in size (shown to the right). |
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| From the calculation side, dealing with discharging objects is dependent on time and is very complicated. For the purpose of this class, //__we will often make the assumption that discharging does not occur__//. Another way to say this would be that we assume //__charge is constant__//, or we assume that the charged object does not interact with the air or another surface. | From the calculation side, dealing with discharging objects is dependent on time and is very complicated. For the purpose of this class, //__we will often make the assumption that discharging does not occur__//. Another way to say this would be that we //__ assume charge is constant__//, or we __//assume that the charged object does not interact with the air or another surface. |
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| ==== Examples ==== | ==== Examples ==== |
| [[184_notes:examples:Week2_conducting_insulating_balls|Attempting to Charge Insulators by Induction]] | [[184_notes:examples:Week2_conducting_insulating_balls|Attempting to Charge Insulators by Induction]] |
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| [[https://www.youtube.com/watch?v=cMM6hZiWnig|Demonstration of charging by induction]] | [[https://www.youtube.com/watch?v=cMM6hZiWnig|Demonstration of charging by induction]] |