Capacitance

Q. A capacitor has a capacitance of 4μF and is charged to 12V. What is the charge on the capacitor?
  • A. 48μC
  • B. 12μC
  • C. 4μC
  • D. 3μC
Q. A capacitor is charged to a voltage of 10V and then connected to a resistor. What will happen to the voltage across the capacitor over time?
  • A. It increases
  • B. It decreases exponentially
  • C. It remains constant
  • D. It oscillates
Q. A capacitor is charged to a voltage V and then connected to a resistor R. What is the time constant of the circuit?
  • A. RC
  • B. C/R
  • C. R/C
  • D. 1/RC
Q. A capacitor is charged to a voltage V and then disconnected from the battery. If the distance between the plates is increased, what happens to the charge?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. A capacitor is charged to a voltage V and then disconnected from the battery. If the distance between the plates is doubled, what happens to the voltage across the capacitor?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. A capacitor is charged to a voltage V and then disconnected from the battery. What happens to the charge on the capacitor?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It becomes zero
Q. A capacitor is charged to a voltage V and then disconnected from the battery. What happens to the charge on the capacitor if the distance between the plates is increased?
  • A. Charge increases
  • B. Charge decreases
  • C. Charge remains the same
  • D. Charge becomes zero
Q. A capacitor is charged to a voltage V and then disconnected from the battery. What happens to the charge on the capacitor if the voltage is doubled?
  • A. Charge doubles
  • B. Charge halves
  • C. Charge remains the same
  • D. Charge quadruples
Q. A capacitor is charged to a voltage V and then the voltage is halved. What happens to the energy stored in the capacitor?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It becomes zero
Q. A capacitor of capacitance C is charged to a voltage V and then connected in parallel with another uncharged capacitor of capacitance C. What is the final voltage across the capacitors?
  • A. V/2
  • B. V
  • C. 2V
  • D. 0
Q. A capacitor of capacitance C is charged to a voltage V. If the voltage is halved, what is the new energy stored in the capacitor?
  • A. U/4
  • B. U/2
  • C. U
  • D. 2U
Q. A capacitor of capacitance C is connected to a battery of voltage V. If the battery is removed and the capacitor is connected to another capacitor of capacitance 2C, what is the final voltage across the combination?
  • A. V/3
  • B. V/2
  • C. V
  • D. 2V
Q. If a capacitor has a capacitance of 10 µF and is charged to 5 V, what is the charge on the capacitor?
  • A. 50 µC
  • B. 5 µC
  • C. 2 µC
  • D. 10 µC
Q. If a capacitor is charged and then short-circuited, what happens to the charge on the capacitor?
  • A. It remains the same
  • B. It is discharged
  • C. It increases
  • D. It becomes zero
Q. If a capacitor is charged to a voltage V and then connected in parallel with an uncharged capacitor, what will be the final voltage across both capacitors?
  • A. V
  • B. V/2
  • C. 2V
  • D. 0
Q. If a capacitor is charged to a voltage V and then connected to a resistor R, what is the time constant of the circuit?
  • A. RC
  • B. R/C
  • C. C/R
  • D. 1/RC
Q. If a capacitor is charged to a voltage V and then short-circuited, what happens to the charge on the capacitor?
  • A. It remains the same
  • B. It becomes zero
  • C. It doubles
  • D. It halves
Q. If a capacitor is charged to a voltage V and then short-circuited, what happens to the energy stored in the capacitor?
  • A. It is conserved
  • B. It is dissipated as heat
  • C. It increases
  • D. It becomes zero
Q. If a capacitor is connected to a DC voltage source, what will happen to the current over time?
  • A. It remains constant
  • B. It increases
  • C. It decreases to zero
  • D. It oscillates
Q. If a capacitor is connected to an AC source, how does the current behave?
  • A. It is constant
  • B. It leads the voltage
  • C. It lags the voltage
  • D. It is zero
Q. If a capacitor is fully discharged and then connected to a voltage source, what is the initial current through the circuit?
  • A. Zero
  • B. Maximum
  • C. Depends on resistance
  • D. Infinite
Q. If a capacitor of capacitance 4μF is connected to a 12V battery, what is the charge on the capacitor?
  • A. 48μC
  • B. 12μC
  • C. 4μC
  • D. 24μC
Q. If a capacitor of capacitance C is charged to a voltage V, what is the energy stored in the capacitor?
  • A. 1/2 CV^2
  • B. CV
  • C. V^2 / C
  • D. C / V
Q. If a capacitor of capacitance C is connected to a voltage source V, what is the charge on the capacitor?
  • A. C/V
  • B. V/C
  • C. CV
  • D. V^2/C
Q. If a capacitor with capacitance C is connected to a voltage V, what is the charge stored in the capacitor?
  • A. C/V
  • B. V/C
  • C. C * V
  • D. C + V
Q. If the distance between the plates of a capacitor is doubled, what happens to its capacitance?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the distance between the plates of a capacitor is halved, what happens to its capacitance?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If two capacitors of capacitance C1 and C2 are connected in series, what is the equivalent capacitance?
  • A. C1 + C2
  • B. 1 / (1/C1 + 1/C2)
  • C. C1 * C2 / (C1 + C2)
  • D. C1 - C2
Q. In a capacitor, if the plate area is increased while keeping the separation constant, what happens to the capacitance?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. In a capacitor, what does the dielectric constant represent?
  • A. The ability to store charge
  • B. The ability to resist electric field
  • C. The ability to increase capacitance
  • D. The ability to conduct electricity
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