Q. The electric potential due to a point charge is given by which formula? (2019)
A.
V = kQ/r
B.
V = Q/r
C.
V = kQ/r^2
D.
V = kQ
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Solution
The electric potential (V) due to a point charge (Q) at a distance (r) is given by V = kQ/r, where k is Coulomb's constant.
Correct Answer: A — V = kQ/r
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Q. The energy stored in a capacitor is directly proportional to which of the following? (2023)
A.
Charge
B.
Voltage
C.
Capacitance
D.
All of the above
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Solution
The energy stored in a capacitor is given by U = 1/2 CV^2, which shows it is proportional to both charge and voltage.
Correct Answer: D — All of the above
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Q. The energy stored in a capacitor is given by which of the following formulas? (2021)
A.
1/2 CV^2
B.
CV
C.
Q/V
D.
1/2 QV
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Solution
The energy (U) stored in a capacitor is given by the formula U = 1/2 CV^2, where C is capacitance and V is voltage.
Correct Answer: A — 1/2 CV^2
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Q. The potential energy stored in a capacitor is directly proportional to which of the following? (2023)
A.
Charge and Voltage
B.
Charge only
C.
Voltage only
D.
Capacitance only
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Solution
The potential energy (U) stored in a capacitor is given by U = 1/2 CV^2, which shows it is directly proportional to both charge and voltage.
Correct Answer: A — Charge and Voltage
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Q. The potential energy stored in a capacitor is given by which of the following formulas? (2020)
A.
1/2 CV^2
B.
CV
C.
Q^2/2C
D.
1/2 QV
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Solution
The potential energy (U) stored in a capacitor is given by U = 1/2 CV^2.
Correct Answer: A — 1/2 CV^2
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Q. Two capacitors of capacitance 2μF and 3μF are connected in series. What is the equivalent capacitance? (2019)
A.
1.2μF
B.
1.5μF
C.
0.86μF
D.
5μF
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Solution
For capacitors in series, 1/C_eq = 1/C1 + 1/C2. Thus, 1/C_eq = 1/2 + 1/3 = 5/6, giving C_eq = 6/5 = 1.2μF.
Correct Answer: C — 0.86μF
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Q. What happens to the capacitance of a capacitor if a dielectric material is inserted between its plates? (2022)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
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Solution
Inserting a dielectric material increases the capacitance of the capacitor by a factor equal to the dielectric constant of the material.
Correct Answer: B — It increases
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Q. What happens to the capacitance of a capacitor if a dielectric material is inserted? (2021)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
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Solution
Inserting a dielectric material between the plates of a capacitor increases its capacitance due to the material's ability to reduce the electric field.
Correct Answer: A — It increases
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Q. What happens to the capacitance of a capacitor if a dielectric material is introduced between its plates? (2021)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
The capacitance increases when a dielectric material is introduced, as it reduces the electric field between the plates.
Correct Answer: A — Increases
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Q. What happens to the electric potential energy when a capacitor is disconnected from a battery and the plates are moved further apart? (2023)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
When a capacitor is disconnected from a battery and the plates are moved further apart, the electric potential energy increases because the capacitance decreases while the charge remains constant.
Correct Answer: A — Increases
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Q. What is the capacitance of a spherical capacitor with inner radius a and outer radius b? (2023)
A.
4πε₀ab/(b-a)
B.
4πε₀/(1/a - 1/b)
C.
4πε₀/(a+b)
D.
4πε₀/(b-a)
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Solution
The capacitance of a spherical capacitor is given by C = 4πε₀ab/(b-a).
Correct Answer: A — 4πε₀ab/(b-a)
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Q. What is the dielectric constant of a vacuum? (2023)
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Solution
The dielectric constant (κ) of a vacuum is defined as 1, which serves as the reference for other materials.
Correct Answer: A — 1
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Q. What is the effect of connecting capacitors in parallel? (2023)
A.
Capacitance decreases
B.
Capacitance increases
C.
Capacitance remains the same
D.
Capacitance becomes zero
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Solution
When capacitors are connected in parallel, the total capacitance is the sum of the individual capacitances, thus it increases.
Correct Answer: B — Capacitance increases
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Q. What is the effect of dielectric on the capacitance of a capacitor? (2021)
A.
Increases capacitance
B.
Decreases capacitance
C.
No effect
D.
Depends on the voltage
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Solution
Introducing a dielectric material between the plates of a capacitor increases its capacitance by a factor equal to the dielectric constant (κ) of the material.
Correct Answer: A — Increases capacitance
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Q. What is the effect of increasing the area of the plates of a capacitor on its capacitance? (2022)
A.
Increases capacitance
B.
Decreases capacitance
C.
No effect
D.
Capacitance becomes zero
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Solution
Increasing the area A of the plates increases the capacitance, as C = εA/d.
Correct Answer: A — Increases capacitance
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Q. What is the effect of increasing the distance between the plates of a capacitor on its capacitance? (2022)
A.
Increases capacitance
B.
Decreases capacitance
C.
No effect
D.
Doubles capacitance
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Solution
Increasing the distance between the plates of a capacitor decreases its capacitance, as capacitance is inversely proportional to the distance.
Correct Answer: B — Decreases capacitance
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Q. What is the effect of increasing the plate area of a parallel plate capacitor on its capacitance? (2022)
A.
Increases capacitance
B.
Decreases capacitance
C.
No effect
D.
Capacitance becomes zero
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Solution
Increasing the plate area A of a parallel plate capacitor increases its capacitance, as C = ε₀A/d.
Correct Answer: A — Increases capacitance
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Q. What is the effect of introducing a dielectric material between the plates of a capacitor? (2019)
A.
Increases capacitance
B.
Decreases capacitance
C.
No effect
D.
Increases resistance
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Solution
Introducing a dielectric material increases the capacitance of a capacitor by reducing the electric field between the plates.
Correct Answer: A — Increases capacitance
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Q. What is the electrostatic potential at a point due to a point charge Q located at a distance r from the charge? (2021)
A.
kQ/r
B.
kQr
C.
kQ/r^2
D.
kQ^2/r
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Solution
The electrostatic potential V at a distance r from a point charge Q is given by V = kQ/r, where k is Coulomb's constant.
Correct Answer: A — kQ/r
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Q. What is the energy stored in a capacitor of capacitance 4μF charged to 12V? (2022)
A.
24μJ
B.
28.8μJ
C.
48μJ
D.
72μJ
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Solution
The energy stored (U) is given by U = 1/2 CV². Thus, U = 1/2 * 4μF * (12V)² = 288μJ.
Correct Answer: C — 48μJ
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Q. What is the energy stored in a capacitor of capacitance C charged to a potential V? (2021)
A.
CV
B.
1/2 CV^2
C.
1/2 QV
D.
QV
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Solution
The energy (U) stored in a capacitor is given by the formula U = 1/2 CV^2.
Correct Answer: B — 1/2 CV^2
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Q. What is the potential energy stored in a capacitor of capacitance C charged to a voltage V? (2021)
A.
CV
B.
1/2 CV^2
C.
1/2 QV
D.
QV
Show solution
Solution
The potential energy (U) stored in a capacitor is given by U = 1/2 CV^2.
Correct Answer: B — 1/2 CV^2
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Q. What is the potential energy stored in a capacitor? (2022)
A.
1/2 CV²
B.
CV
C.
1/2 QV
D.
QV
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Solution
The potential energy (U) stored in a capacitor is given by the formula U = 1/2 CV², where C is the capacitance and V is the voltage across the capacitor.
Correct Answer: A — 1/2 CV²
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Q. What is the relationship between charge (Q), capacitance (C), and voltage (V) in a capacitor? (2023)
A.
Q = CV
B.
Q = C/V
C.
Q = V/C
D.
Q = C + V
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Solution
The relationship is given by Q = CV, where Q is the charge, C is the capacitance, and V is the voltage across the capacitor.
Correct Answer: A — Q = CV
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Q. What is the relationship between electric field (E) and electric potential (V) in a uniform field? (2022)
A.
E = V/d
B.
E = d/V
C.
E = V^2
D.
E = V/d^2
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Solution
In a uniform electric field, the electric field E is related to the potential difference V and the distance d by the equation E = V/d.
Correct Answer: A — E = V/d
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Q. Which of the following materials is commonly used as a dielectric in capacitors? (2023)
A.
Copper
B.
Glass
C.
Iron
D.
Aluminum
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Solution
Glass is commonly used as a dielectric material in capacitors due to its high dielectric constant and insulating properties.
Correct Answer: B — Glass
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Q. Which of the following statements is true regarding capacitors in parallel? (2022)
A.
Total capacitance is the sum of individual capacitances
B.
Total capacitance is the product of individual capacitances
C.
Total capacitance is always less than the smallest capacitance
D.
Total capacitance is independent of the voltage
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Solution
For capacitors in parallel, the total capacitance is the sum of the individual capacitances: C_total = C₁ + C₂ + ...
Correct Answer: A — Total capacitance is the sum of individual capacitances
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