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en/8.2.28.md
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| + | ### Statement | ||
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| + | $8.2.28.$ [Insert the problem statement] | ||
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| + | ### Solution | ||
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| + | The force per unit charge $E_c$ is equivalent to the electric field strength. Thus, the work done per unit charge by the force on a section $l$ of the circuit is $W=E_cl$, which is the same as the potential difference between the two endpoints of this section. The graphs show potential difference between each point in the circuit and point $A$. When the circuit is open (shown in red), the only change in potential is across the section of length $l$. When the circuit is closed (shown in green), there is also potential drop of $-E_cl$ across the resistor. (Note the discontinuity in the potential between points $C'$ and $A$ in the open circuit. | ||
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| + | #### Answer | ||
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| + | [Insert a concise answer or boxed result] | ||
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| ### Statement | |||
| $8.2.28.$ [Insert the problem statement] | |||
| ### Solution | |||
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| The force per unit charge $E_c$ is equivalent to the electric field strength. Thus, the work done per unit charge by the force on a section $l$ of the circuit is $W=E_cl$, which is the same as the potential difference between the two endpoints of this section. The graphs show potential difference between each point in the circuit and point $A$. When the circuit is open (shown in red), the only change in potential is across the section of length $l$. When the circuit is closed (shown in green), there is also potential drop of $-E_cl$ across the resistor. (Note the discontinuity in the potential between points $C'$ and $A$ in the open circuit. | |||
| #### Answer | |||
| [Insert a concise answer or boxed result] | |||