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| 184_notes:motiv_movingq [2018/01/27 17:44] – dmcpadden | 184_notes:motiv_movingq [2020/08/23 19:19] – dmcpadden |
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| ===== Modeling Moving Charges ===== | /*[[184_notes:batteries|Next Page: Batteries]] |
| Over the last five weeks of class, we've have spent a lot of time modeling [[184_notes:charge|stationary charges and their interactions]], including [[184_notes:pc_force|electric force]], [[184_notes:pc_efield|electric field]], [[184_notes:pc_energy|electric potential energy]], and [[184_notes:pc_potential|electric potential]]. We've discussed these ideas in the context of point charges, [[184_notes:line_fields|lines of charge]], and [[184_notes:dist_charges|distributions (or volumes) of charge]]. This week, we will shift our focus to modeling moving charges, starting with one simple question: what would happen if we connected two charged, parallel plates with a thin, conducting wire? | |
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| {{youtube>GvBlDYZaN4E?large}} | [[184_notes:patterns_fields|Previous Page: Patterns in the Electric Field]]*/ |
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| | ===== Modeling Moving Charges ===== |
| | Thus far in class, we've have spent a lot of time modeling [[184_notes:charge|stationary charges and their interactions]], including [[184_notes:pc_force|electric force]], [[184_notes:pc_efield|electric field]], [[184_notes:pc_energy|electric potential energy]], and [[184_notes:pc_potential|electric potential]]. We've discussed these ideas in the context of point charges, [[184_notes:line_fields|lines of charge]], and [[184_notes:dist_charges|distributions (or volumes) of charge]]. Now, we will shift our focus to modeling moving charges - which has incredibly important applications for how electricity and circuits work. Using what we know about charges and electric field, we will start with one simple question: what would happen if we connected two charged, parallel plates with a thin, conducting wire? |
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| | {{youtube>Xcea_cZhnPg?large}} |
| ==== Connecting Two Charged Plates ==== | ==== Connecting Two Charged Plates ==== |
| Suppose we start with two charged, conducting plates - one with a net positive charge (+Q) on the plate and one with an equal amount of excess negative charge (-Q) on the plate. [[184_notes:charge_and_matter#Types_of_Matter|Because the plates are conducting]], we know that the electrons in the plates can easily move through the material, so it is safe to assume that __//each of the plates has a uniform distribution of charge//__ on the surface. | Suppose we start with two charged, conducting plates - one with a net positive charge (+Q) on the plate and one with an equal amount of excess negative charge (-Q) on the plate. [[184_notes:charge_and_matter#Types_of_Matter|Because the plates are conducting]], we know that the electrons in the plates can easily move through the material, so it is safe to assume that __//each of the plates has a uniform distribution of charge//__ on the surface. |
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| {{ 184_notes:fullcap.jpg?200}} | [{{ 184_notes:wireandplates.png?300|Two charged plates connected by a small conducting wire}}] |
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| [[184_notes:charge|Based on what we know about how charges interact]], what would you expect to happen if we connect these plates with a small conducting wire? [[184_notes:charge_and_matter|Remember that in matter (and specifically in conductors)]], the electrons are the charges that are mobile. | [[184_notes:charge|Based on what we know about how charges interact]], what would you expect to happen if we connect these plates with a small conducting wire? [[184_notes:charge_and_matter|Remember that in matter (and specifically in conductors)]], the electrons are the charges that are mobile. |