(A) When the switch $S$ is closed,the capacitor begins to charge. Initially,the capacitor acts as a short circuit (zero resistance),allowing current t

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The bulb will light up for an instant when the capacitor starts charging.

(A) When the switch $S$ is closed,the capacitor begins to charge. Initially,the capacitor acts as a short circuit (zero resistance),allowing current to flow through the circuit,which causes the bulb to light up for an instant. As the capacitor charges,the potential difference across it increases,and the current in the circuit decreases. Once the capacitor is fully charged,it acts as an open circuit,blocking the flow of direct current $(DC)$. Therefore,the current becomes zero,and the bulb stops glowing.

Class 12 Physics Electric Potential and Capacitance Charging and Discharging of Capacitance and RC circuit (DC)

Medium

$A$ light bulb,a capacitor,and a battery are connected in a series circuit as shown in the figure,with switch $S$ initially open. When the switch $S$ is closed,which one of the following is true?

A
The bulb will light up for an instant when the capacitor starts charging.
B
The bulb will light up when the capacitor is fully charged.
C
The bulb will not light up at all.
D
The bulb will light up and go off at regular intervals.

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Class 12 Questions

Class 12

Physics Questions

Chapter

Electric Potential and Capacitance

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Charging and Discharging of Capacitance and RC circuit (DC)

$A$ capacitor is connected to a $20\, V$ battery through a resistance of $10\, \Omega$. It is found that the potential difference across the capacitor rises to $2\, V$ in $1\, \mu s$. The capacitance of the capacitor is $....\, \mu F$. Given: $\ln(10/9) = 0.105$.

DifficultJEE MAIN 2021

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In the circuit shown in the diagram,the capacitances of the capacitors $C_1$,$C_2$,and $C_3$ are $4\ \mu F$,$6\ \mu F$,and $12\ \mu F$ respectively. The switch $S$ remains closed for a long time. When the switch $S$ is opened,which of the following statements will be correct about the current flowing through the battery $B$?

Medium

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$A$ parallel plate capacitor is charged to a potential difference of $50 \, V$. It is discharged through a resistance. After $1 \, s$,the potential difference between the plates becomes $40 \, V$. Then:

Medium

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$A$ $20 \mu F$ capacitor is connected to a $45 \text{ V}$ battery through a circuit whose resistance is $2000 \Omega$. What is the final charge on the capacitor?

MediumMHT CET 2008

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The plates of a capacitor are charged to a potential difference of $320 \, V$ and are then connected across a resistor. The potential difference across the capacitor decays exponentially with time. After $1 \, s$ the potential difference between the plates of the capacitor is $240 \, V$,then after $2 \, s$ and $3 \, s$ the potential difference between the plates will be:

Difficult

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$A$ light bulb,a capacitor,and a battery are connected in a series circuit as shown in the figure,with switch $S$ initially open. When the switch $S$ is closed,which one of the following is true?

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$A$ capacitor is connected to a $20\, V$ battery through a resistance of $10\, \Omega$. It is found that the potential difference across the capacitor rises to $2\, V$ in $1\, \mu s$. The capacitance of the capacitor is $....\, \mu F$. Given: $\ln(10/9) = 0.105$.

$A$ parallel plate capacitor is charged to a potential difference of $50 \, V$. It is discharged through a resistance. After $1 \, s$,the potential difference between the plates becomes $40 \, V$. Then:

$A$ $20 \mu F$ capacitor is connected to a $45 \text{ V}$ battery through a circuit whose resistance is $2000 \Omega$. What is the final charge on the capacitor?

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