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Previous Year Questions

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1,573 Questions
CBSE
#1 Class Class 12 Physics Electric Potential & Capacitance 2019 Short 2M
One charge particle is moved from A→C→B and another from A→D→B in a uniform external electric field. For which charge particle more work is needed?
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CBSE
#2 Class Class 12 Physics Electric Potential & Capacitance 2020 Short 2M
A capacitor of capacitance 50 µF is charged to a potential of 1000 V. Calculate the energy stored in the capacitor.
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CBSE
#3 Class Class 12 Physics Electric Potential & Capacitance 2022 Short 3M
A charge of 1 µC is placed at origin and another charge of 3 µC placed at (20 m, 0, 0) in external uniform electric field of 40 V/m î, with potential at origin = 0. Find the electrical potential energy of the system.
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CBSE
#4 Class Class 12 Physics Electric Potential & Capacitance 2024 Long 5M
(A) A dielectric slab of thickness t, is introduced between the plates of parallel plate capacitor of area A and separation d (where t<d). Find an expression for the capacitance with the dielectric slab.

(B) A copper sphere of capacitor C is dropped in ocean. Will the capacitance of the sphere increase, decrease or remain same? Justify.

(C) A capacitor is connected across a source of potential difference V and then the separation ‘d’ between the plates is increased using insulating stick. Plot ‘V’ vs ‘d’ graph for the given capacitor.
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CBSE
#5 Class Class 12 Physics Electric Potential & Capacitance 2023 Long 2M
If a charged hollow sphere and solid sphere of equal radii (aluminum and copper) are in electrostatic equilibrium, which statement is true? (A) Both have equal charges. (B) Hollow sphere has more surface charge. (C) Aluminum sphere has more surface charge than copper. (D) If hollow sphere is also aluminum, it will have more charge.
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CBSE
#6 Class Class 12 Physics Electric Potential & Capacitance 2021 Short 2M
For any charge configuration, equipotential surface through a point is normal to the electric field. Justify.
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CBSE
#7 Class Class 12 Physics Electric Potential & Capacitance 2020 Short 2M
In a certain 0.5 cm³ of space, electric potential is found to be 7 V throughout. What is the electric field in this region?
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CBSE
#8 Class Class 12 Physics Electric Potential & Capacitance 2018 Short 2M
Why is there no work done in moving a charge from one point to another on an equipotential surface?
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CBSE
#9 Class Class 12 Physics Electric Potential & Capacitance 2019 Short 2M
A hollow metal sphere of radius 5 cm is charged such that potential on its surface is 10 V. What is the potential at the centre of the sphere?
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CBSE
#10 Class Class 12 Physics Electric Potential & Capacitance 2020 Mcq 1M
A parallel plate capacitor with oil between the plates (dielectric constant K = 2) has a capacitance C. If the oil is removed, then capacitance of the capacitor becomes
A. C/2
B. 2C
C. C/4
D. 4C
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CBSE
#11 Class Class 12 Physics Electric Potential & Capacitance 2021 Mcq 1M
When two charged capacitors having capacitance and potential C₁, V₁ and C₂, V₂ respectively, are joined with a wire, the common potential will be
A. (C₁V₁ + C₂V₂)/(C₁+C₂)
B. (C₁V₁ − C₂V₂)/(C₁+C₂)
C. C₁V₁/C₂V₂
D. (V₁+V₂)/2
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CBSE
#12 Class Class 12 Physics Electric Potential & Capacitance 2019 Short 2M
A 10 µF capacitor is charged by a battery of e.m.f. 100 V. The electrostatic energy stored in the capacitor is
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CBSE
#13 Class Class 12 Physics Electric Potential & Capacitance 2022 Mcq 1M
A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates (battery disconnected). The quantity that remains unchanged is
A. Charge
B. Energy
C. Potential
D. Capacitance
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CBSE
#14 Class Class 12 Physics Electric Potential & Capacitance 2020 Mcq 1M
The energy stored in a capacitor is actually stored
A. between the plates
B. on the positive plate
C. on the negative plate
D. on the outer surfaces of the plates
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CBSE
#15 Class Class 12 Physics Electric Potential & Capacitance 2018 Mcq 1M
The charge on plate X in the given figure (capacitor with plate Y having charge +20 µC)
A. +20 µC
B. −20 µC
C. 0 µC
D. 40 µC
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CBSE
#16 Class Class 12 Physics Electric Potential & Capacitance 2019 Mcq 1M
A parallel plate air capacitor is charged to a potential difference of V. If distance between the plates is increased (battery disconnected), then potential difference between the plates
A. decreases
B. increases
C. becomes zero
D. does not change
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CBSE
#17 Class Class 12 Physics Electric Potential & Capacitance 2021 Mcq 1M
Minimum number of capacitors of 2 µF each required to obtain a capacitance of 5 µF will be
A. 4
B. 3
C. 5
D. 6
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CBSE
#18 Class Class 12 Physics Electric Potential & Capacitance 2016 Mcq 1M
The capacitance of a parallel plate capacitor ..........by the introduction of a dielectric between the plates of capacitor.
A. increases
B. decreases
C. remains same
D. nothing can be said
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CBSE
#19 Class Class 12 Physics Electric Potential & Capacitance 2018 Mcq 1M
Two plates of a parallel plate capacitor are 1 cm apart and potential difference between them is 10 V. The electric field between the plates is
A. 100 V/m
B. 1000 V/m
C. 10 V/m
D. 10000 V/m
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CBSE
#20 Class Class 12 Physics Electric Potential & Capacitance 2017 Mcq 1M
The ratio of charge to potential of a capacitor is known as its
A. Capacitance
B. Conductance
C. Inductance
D. Resistance
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