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Previous Year Questions

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9,374 Questions
CBSE
#1 Class 12 Physics Electric Charges and Fields 2019 Long 5M
What is an electric dipole? Derive an expression for the torque acting on an electric dipole when held in a uniform electric field. Hence, define the dipole moment.
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CBSE
#2 Class 12 Physics Electric Charges and Fields 2018 Short 3M
Two infinitely large plane thin parallel sheets having surface charge densities σ₁ and σ₂ (σ₁ > σ₂) are shown in the figure. Write the magnitudes and directions of the net fields in the regions marked II and III.
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CBSE
#3 Class 12 Physics Electric Charges and Fields 2024 Long 5M
(a) Define electric flux and write its SI unit. (b) Use Gauss\'s law to obtain the expression for the electric field due to a uniformly charged infinite plane sheet of charge.
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CBSE
#4 Class 12 Physics Electric Charges and Fields 2024 Long 5M
State Gauss\'s theorem in electrostatics. Using this theorem, derive an expression for the electric field due to an infinitely long straight wire of linear charge density λ.
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CBSE
#5 Class 12 Physics Electric Charges and Fields 2018 Short 3M
A charge q is placed inside a sphere of radius \"a\" filled with water and another charge 2q is placed inside a cube of side \"2a\" which is vacuumed inside. Find the ratio of the flux linked with the sphere to that l...
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CBSE
#6 Class 12 Physics Electric Charges and Fields 2019 Short 3M
Two point charges q₁ and q₂ are located at points (a, 0, 0) and (0, b, 0) respectively. Find the electric field due to both these charges at the point (0, 0, c).
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CBSE
#7 Class 12 Physics Electric Charges and Fields 2017 Short 3M
An electric dipole is placed in a uniform electric field <b>E</b> with its dipole moment <b>p</b> parallel to the field. Find:<br><br> (1) The work done in turning the dipole till its dipole moment points in the direc...
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CBSE
#8 Class 12 Physics Electric Charges and Fields 2010 Short 2M
What is the nature of electrostatic force between two point electric charges q₁ and q₂ if (a) q₁ + q₂ &gt; 0 (b) q₁ × q₂ &lt; 0 ?
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CBSE
#9 Class 12 Physics Electric Charges and Fields 2024 Short 2M
Two equal balls having equal positive charge q coulombs are suspended by two insulating strings of equal length. What would be the effect on the force when a plastic sheet is inserted between the two?
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CBSE
#10 Class 12 Physics Electric Charges and Fields 2010 Short 2M
Compare the electric fields due to a monopole (single charge) and dipole.
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CBSE
#11 Class 12 Physics Electric Charges and Fields 2024 Short 2M
Why do the electric field lines never cross each other?
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CBSE
#12 Class 12 Physics Electric Charges and Fields 2024 Short 2M
Why do the electrostatic field lines not form closed loops?
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CBSE
#13 Class 12 Physics Electric Charges and Fields 2024 Short 2M
Figure shows the field lines of a positive charge. Is the work done by the field in moving a small positive charge from Q to P positive or negative? Give reason.
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CBSE
#14 Class 12 Physics Electric Charges and Fields 2024 Short 3M
A thin straight infinitely long conducting wire having charge density λ is enclosed by a cylindrical surface of radius r and length l, its axis coinciding with the length of the wire. Find the expression for the elect...
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CBSE
#15 Class 12 Physics Electric Charges and Fields 2024 Short 2M
What is the electric flux through a cube of side 1 cm which encloses an electric dipole?
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CBSE
#16 Class 12 Physics Electric Charges and Fields 2024 Short 2M
Define electric dipole moment. Is it a scalar or a vector quantity? What is its SI unit?
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CBSE
#17 Class 12 Physics Electric Charges and Fields 2024 Short 2M
What is electrostatic shielding? Give one of its practical applications.
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CBSE
#18 Class 12 Physics Electric Charges and Fields 2024 Short 2M
Why should electrostatic field be zero inside a conductor?
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CBSE
#19 Class 12 Physics Electric Charges and Fields 2024 Short 2M
Why must electrostatic field at the surface of a charged conductor be perpendicular to every point on it?
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CBSE
#20 Class 12 Physics Electric Charges and Fields 2024 Long 1M
<b>Assertion (A):</b> Work done in moving a charge around a closed path in an electric field is always zero.<br><br><b>Reason (R):</b> Electrostatic force is a conservative force.
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