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#1 Class 12 Physics Electric Charges and Fields 2024 Short 2M CBSE
Why should electrostatic field be zero inside a conductor?
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#2 Class 12 Physics Electric Charges and Fields 2024 Short 2M CBSE
Why must electrostatic field at the surface of a charged conductor be perpendicular to every point on it?
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#3 Class 12 Physics Electric Charges and Fields 2024 Long 1M CBSE
<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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#4 Class 12 Physics Electric Charges and Fields 2024 Mcq 1M CBSE
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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#5 Class 12 Physics Electric Charges and Fields 2024 Mcq 1M CBSE
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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#6 Class 12 Physics Electric Charges and Fields 2024 Mcq 1M CBSE
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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#7 Class 12 Physics Electric Charges and Fields 2024 Mcq 1M CBSE
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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#8 Class 12 Physics Electric Charges and Fields 2024 Mcq 1M CBSE
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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#9 Class 12 Physics Electric Charges and Fields 2024 Short 2M CBSE
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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#10 Class 12 Physics Electric Charges and Fields 2021 Mcq 1M CBSE
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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#11 Class 12 Physics Electric Charges and Fields 2024 Mcq 1M CBSE
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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#12 Class 12 Physics Electric Charges and Fields 2011 Mcq 1M CBSE
Two charged spheres separated by a distance d exert some force F on each other. If they are immersed in a liquid of dielectric constant 4, then what is the force exerted, if all other conditions are same?
A. 2F
B. 4F
C. F/2
D. F/4
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#13 Class 12 Physics Electric Charges and Fields 2024 Mcq 1M CBSE
The electrostatic field is:
A. conservative
B. non-conservative
C. both (a) and (b)
D. none of these
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#14 Class 12 Physics Electric Charges and Fields 2019 Mcq 1M CBSE
When a body is charged, its mass:
A. increases
B. decreases
C. remains same
D. may increase or decrease
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#15 Class 12 Physics Electric Charges and Fields 2019 Mcq 1M CBSE
When a body is connected to the earth, then electrons from the earth flow into the body. It means that the body is:
A. unchanged
B. an insulator
C. positively charged
D. negatively charged
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#16 Class 12 Physics Electric Charges and Fields 2021 Mcq 1M CBSE
Ampere-hour is unit of:
A. Power
B. Charge
C. Energy
D. Potential difference
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#17 Class 12 Physics Electric Charges and Fields 2023 Mcq 1M CBSE
The magnitude of the electric field due to a point charge object at a distance of 4.0 m is 9 N/C. From the same charged object the electric field of magnitude 16 N/C will be at a distance of:
A. 1 m
B. 2 m
C. 3 m
D. 6 m
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