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Electric Charges and Fields - ISC Class 12 Physics Questions with Answers

39 past-paper questions on Electric Charges and Fields from ISC Class 12 Physics papers (2027-2018), newest first. Open one to see its answer.

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Two point charges $Q_1$ and $Q_2$, separated by a distance, are such that there is no neutral point (where electric field is… 2027 · 1 mark · Short answer
Obtain an expression of intensity of electric field at a point lying on the axis of an electric dipole. (End on position / axial… 2027 · 3 marks · Derivation
A point charge $-Q$ and three points A, B and C are shown in Figure 1 below. If V is electric potential and E is electric field… 2027 · 1 mark · MCQ
Two point charges $+50\text{ nC}$ and $-50\text{ nC}$ separated by a distance of $1\text{ mm}$ are kept well inside a large… 2026 · 1 mark · MCQ
Four-point charges $Q_{1}=+17\cdot7\mu C,$ $Q_{2}=-8\cdot85\mu C,$ $Q_{3}=-17\cdot7\mu C$ and $Q_{4}=35\cdot4\mu C$ are kept as… 2026 · 2 marks · Numerical
Show that the intensity of electric field at a point in end on position i.e., axial position of an electric dipole is given by… 2026 · 3 marks · Derivation
Arrangement of an oxygen ion and two hydrogen ions in a water molecule is shown in Figure 4 below. Calculate electric dipole… 2026 · 2 marks · Numerical
Answer the following questions: An electric dipole having dipole moment 'p' is kept in a uniform electric field E, with its axis… 2026 · 2 marks · Short answer
Five identical charges $Q = 2\mu\text{C}$ are placed equidistant on a semicircle as shown in Figure 9. Another point charge… 2026 · 3 marks · Numerical
Show that the intensity of electric field at a point on broadside position of an electric dipole is given by… 2026 · 3 marks · Derivation
Electrostatic precipitators: Electrostatic precipitators are devices used to remove particles, such as dust and ash, from a… 2025 · 5 marks · Long answer
In case of a short electric dipole: What is the locus of a point having zero potential? If electric field intensity at a point in… 2025 · 2 marks · Short answer
An infinite plane metallic sheet having surface charge density ‘$+\sigma$’ is placed in vacuum. P is a point at a small distance… 2025 · 3 marks · Short answer
Two Gaussian surfaces, $S_1$ and $S_2$ are shown in Figure 6 below. What is the ratio of electric flux emerging out of these two… 2025 · 2 marks · Short answer
Four charges $+Q, +Q, -Q$, and $-Q$ are placed in an arrangement as shown. The direction of the net electric field at a point 'P'… 2025 · 1 mark · Short answer
Arrangement of an oxygen ion and two hydrogen ions in a water molecule is shown in Figure 3 below. Calculate electric dipole… 2025 · 2 marks · Numerical
“A uniformly charged conducting spherical shell for the points outside the shell behaves as if the entire charge of the shell is… 2025 · 3 marks · Short answer
A student starts working on a problem on Gauss' theorem to calculate the flux and hence the electric field at a given point due… 2025 · 3 marks · Long answer
A non-conducting sphere A, attached to an insulated handle is given a charge $+q$. It is brought near a non-conducting sphere B… 2025 · 1 mark · MCQ
A hollow sphere made of material 'X' is placed in a region of electric field. The pattern of electric field lines around the… 2025 · 1 mark · Short answer
Derive an expression for electric field intensity (E) at a point which lies on the axis of an electric dipole (having length $2l$… 2025 · 3 marks · Derivation
What is meant by the statement: “Relative permittivity of water is 81”? Can a body be given a charge of… 2024 · 2 marks · Short answer
A hollow sphere of radius R has a point charge q at its centre. Electric flux emanating from the sphere is X. How will the… 2024 · 2 marks · Short answer
In case of an infinite line charge, how does intensity of electric field at a point change, if at all, when charge on it is… 2024 · 2 marks · Short answer
A hollow sphere of radius $R$ has a point charge $Q$ at its centre. Electric flux emanating from it is $\phi$. If both the charge… 2023 · 1 mark · MCQ
Obtain an expression for intensity of electric field at a point in end on position i.e. on an axial line of an electric dipole. 2023 · 3 marks · Derivation
The surface charge density of a large conducting sheet is $17\cdot7 \times 10^{-6}\text{ C}\cdot\text{m}^{-2}$. The electric… 2023 · 1 mark · MCQ
Show that intensity of electric field at a point in broadside position of an electric dipole is given by… 2023 · 3 marks · Derivation
In figure 3 given below, Electric field intensity ‘E’ at a point P, at a perpendicular distance ‘r’ from an infinitely long line… 2022 · 1 mark · MCQ
The surface charge density of a conductor, in the absence of another conductor: 2022 · 1 mark · MCQ
Four charges are arranged at the corners of a square ABCD , as shown in the adjoining figure. The force on the charge ‘Q’ kept at… 2022 · 1 mark · MCQ
A charge placed at a distance from a short electric dipole in the end-on position experiences a force F. If the distance is… 2022 · 1 mark · MCQ
The ratio of forces between two small spheres having a constant charge ‘q’ when placed in air to when placed in a medium of… 2022 · 1 mark · MCQ
When a soap bubble is given a positive charge, then its radius: 2022 · 1 mark · MCQ
Show that intensity of electric field $E$ at a point in broadside on position is given by… 2020 · 3 marks · Derivation
State Gauss’ theorem. 2020 · 1 mark · Short answer
A closed surface in vacuum encloses charges $-q$ and $+3q$. The total electric flux emerging out of the surface is: 2019 · 1 mark · MCQ
Using Gauss’ theorem, obtain an expression for intensity of electric field ‘$E$’ at a point, which is at a distance ‘$r$’ (… 2018 · 3 marks · Derivation
Obtain an expression for intensity of electric field at a point in end on position, i.e. axial position of an electric dipole. 2018 · 3 marks · Derivation

Electric Charges and Fields - ISC Class 12 Physics Questions with Answers

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