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Previous Year Questions

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4,686 Questions
CBSE
#1 Class 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
#2 Class 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
#3 Class 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
#4 Class 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
#5 Class 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
#6 Class 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
#7 Class 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
#8 Class 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
#9 Class 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
#10 Class Class 12 Physics Electric Charges and Fields 2024 Short 2M
Why should electrostatic field be zero inside a conductor?
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CBSE
#11 Class 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
#12 Class 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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CBSE
#13 Class Class 12 Physics Electric Charges and Fields 2024 Mcq 1M
The S.I. unit of electric field E is:
A. N/C
B. V/m
C. Both (a) and (b)
D. C/N
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CBSE
#14 Class Class 12 Physics Electric Charges and Fields 2024 Mcq 1M
Two point charges each equal to 2 mC are 0.5 m apart. If both of them exist inside vacuum, then electrostatic force between them is:
A. 1.44 × 10⁵ N
B. 1.44 × 10⁴ N
C. 1.44 × 10³ N
D. 1.44 × 10² N
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CBSE
#15 Class Class 12 Physics Electric Charges and Fields 2024 Mcq 1M
The electric field at a distance 2 cm from the centre of a hollow spherical conducting shell of radius 4 cm having a charge of 2 × 10⁻³ C on its surface is:
A. Zero
B. 4.5 × 10⁷ N/C
C. 2.25 × 10⁷ N/C
D. 9 × 10⁹ N/C
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CBSE
#16 Class Class 12 Physics Electric Charges and Fields 2024 Mcq 1M
A charge q is placed at the centre of the line joining two equal point charges each equal to +Q. The system of three charges will be in equilibrium, if q is equal to:
A. +Q/2
B. -Q/2
C. +Q/4
D. -Q/4
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CBSE
#17 Class Class 12 Physics Electric Charges and Fields 2024 Mcq 1M
An electric dipole placed in an electric field of intensity 2 × 10⁵ N/C at an angle of 30° experiences a torque equal to 4 N·m. The charge on the dipole of dipole length 2 cm is:
A. 7 µC
B. 8 mC
C. 2 mC
D. 5 mC
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CBSE
#18 Class Class 12 Physics Electric Charges and Fields 2024 Short 2M
A conducting wire connects two charged conducting spheres of radii r₁ and r₂ such that they attain equilibrium with respect to each other. The distance of separation between the two spheres is very large as compared t...
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CBSE
#19 Class Class 12 Physics Electric Charges and Fields 2021 Mcq 1M
Three charges, each equal to +q, are placed at the corners of an equilateral triangle. If the force between any two charges is F, then net force on either charge will be:
A. 2F
B. 3F
C. √2 F
D. √3 F
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CBSE
#20 Class Class 12 Physics Electric Charges and Fields 2024 Mcq 1M
Three point charges are placed at the corners of an equilateral triangle. Assuming only electrostatic forces are acting, the system:
A. Can never be in equilibrium
B. Will be in equilibrium if charges rotate about the centre of the triangle
C. Will be in equilibrium if charges have same magnitude but different signs
D. Will be in equilibrium if charges have different magnitudes and different signs
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