The following questions are referring to this left figure. ( ) When a capacitor
ID: 1569764 • Letter: T
Question
The following questions are referring to this left figure.
( ) When a capacitor is being charged, the charges jump across the gap between its two plates.
( ) When a capacitor is being charged, the voltage across the capacitor increases gradually up to the battery’s voltage.
( ) When a capacitor is being charged, the voltage across the capacitor increases suddenly jump to the battery’s voltage.
( ) The value of the maximum charges on the capacitor (when it is fully charged) plates is determined by the battery voltage and the capacitance. Qmax= the battery voltage times the capacitance.
( ) When the capacitor is fully charged, the current in the circuit will stay at a stable and constant amount.
( ) When the capacitor is fully charged, the current in the circuit will be zero.
( ) The voltage across the capacitor is equal to q/C at any time, when the stored charge is q.
( ) The voltage across the resistor is equal to iR at any time, when the current is “i”.
( ) The battery voltage is equal to q/C plus iR at any given time.
( ) The battery voltage is equal to q/C minus iR at any given time.
( ) The capacitor and the resistor are in series, and they share or “divide” the total voltage provided by the battery. Their voltage sum is always equal to the battery voltage.
( ) The voltage across the capacitor and the resistor are both equal to the battery voltage.
( ) When the voltage across the capacitor increases, the voltage across the resistor decreases.
( ) When the voltage across the capacitor increases, the voltage across the resistor increases.
( ) At t=0, at the moment when the switch is thrown at position “a”, the current is zero.
( ) At t=0, at the moment when the switch is thrown at position “a”, the current is at its maximum value.
( ) At t=0, at the moment when the switch is thrown at position “a”, the charge is zero, so is the voltage across the capacitor. Hence the voltage across the resistor occupies the total battery voltage, hence current is at its maximum value Imax=battery voltage/R.
( ) When charges are moved toward the capacitor plate, the instantaneous current at any moment is defined to be i=dq/dt.
( )
( )
( )
( )
( ) is true when the capacitor is being charged.
( ) is true when the capacitor is being charged.
( ) is true when the capacitor is being charged, at time t = infinity, current I=0.
( ) is true when the capacitor is being discharged, at time t = infinity, current I=Imax.
( ) If , when x=0, y=A. When x=infinite, y=0.
( ) If , when x=0, y=0. When x=infinite, y=A.
( ) If , when x=B, y=A/e, which is roughly 0.368A.
( ) If , we need , for y to decay to half of the maximum value A.
( ) The product RC has the unit Ohm times Farad, which is equal to second, the SI unit of time.
. The following questions are referring the left figure.
( ) When a capacitor is being discharged, the voltage across the capacitor decreases gradually toward zero.
( ) When a capacitor is being charged, the voltage across the capacitor suddenly jumps to zero.
( ) The value of the maximum voltage across the capacitor (right at the moment when it starts to discharge) is determined by the initial amount of charge and the capacitance. Vc_max= the initial charge / the capacitance.
( ) When the capacitor is fully discharged, the current in the circuit will stay at a stable and constant amount.
( ) When the capacitor is fully discharged, the current in the circuit will be zero.
( ) In this situation, the battery is disconnected. The current still forms a loop and the capacitor and the resistor are still in series in that loop. The voltage across the capacitor and the voltage across the capacitor are equal and opposite, and add to zero.
( ) When the absolute value of the voltage across the capacitor increases, the absolute value of the voltage across the resistor decreases.
( ) When the absolute value of the voltage across the capacitor decreases, the absolute value of the voltage across the resistor decreases.
( ) At t=0, at the moment when the switch is thrown at position “b”, the current is zero.
( ) At t=0, at the moment when the switch is thrown at position “b”, the current is at its maximum value.
( ) At t=0, at the moment when the switch is thrown at position “b”, the charge is at the maximum, so is the voltage across the capacitor. After that, both the charge and the voltage will decay exponentially.
( ) is true when the capacitor is being discharged.
( ) is true when the capacitor is being discharged.
( ) is true when the capacitor is being discharged, at time t = infinity, current I=0.
( ) is true when the capacitor is being discharged, at time t = infinity, current I=0.
True or false only no need for explanation
Explanation / Answer
1. FALSE - When a capacitor is being charged, the charges jump across the gap between its two plates.
2. TRUE -When a capacitor is being charged, the voltage across the capacitor increases gradually up to the battery’s voltage.
3. FALSE - When a capacitor is being charged, the voltage across the capacitor increases suddenly jump to the battery’s voltage.
4. TRUE- The value of the maximum charges on the capacitor (when it is fully charged) plates is determined by the battery voltage and the capacitance. Qmax= the battery voltage times the capacitance.
5. FALSE - When the capacitor is fully charged, the current in the circuit will stay at a stable and constant amount.
6. TRUE - When the capacitor is fully charged, the current in the circuit will be zero.
7. TRUE - The voltage across the capacitor is equal to q/C at any time, when the stored charge is q.
8. TRUE - The voltage across the resistor is equal to iR at any time, when the current is “i”.
9. Figure is missing - The battery voltage is equal to q/C plus iR at any given time.
10. Figure is missing -The battery voltage is equal to q/C minus iR at any given time.
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