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#1 Class 12 Physics Current Electricity 2019 Short 2M CBSE
A cell of emf $E$ is connected across an external resistance $R$. When current $I$ is drawn from the cell, the potential difference across the electrodes drops to $V$. Write the expression for the internal resistance ...
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#2 Class 12 Physics Current Electricity 2020 Mcq 1M CBSE
A current of 0.8 A flows in a conductor of 40 $\Omega$ for 1 minute. The heat produced in the conductor will be
A. 1445 J
B. 1536 J
C. 1569 J
D. 1640 J
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#3 Class 12 Physics Electrostatic Potential and Capacitance 2023 Short 5M CBSE
Twenty seven spherical drops of radius 3 mm and carrying 10⁻¹² C of charge each are combined to form a single drop. Find the capacitance and potential of the bigger drop.
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#4 Class 12 Physics Electrostatic Potential and Capacitance 2024 Short 5M CBSE
An electric dipole of length 2 cm is placed with its axis making 30° to a uniform electric field of 10⁵ N/C. It experiences a torque of 10√3 N·m. Find (i) magnitude of charge on dipole and (ii) potential energy of the...
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#5 Class 12 Physics Electrostatic Potential and Capacitance 2020 Mcq 1M CBSE
A point charge +q is placed at origin O. Work done in taking another point charge −Q from point A (0, a) to point B (a, 0) along straight path AB is
A. Zero
B. kqQ/a²
C. −kqQ/a
D. kqQ/a
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#6 Class 12 Physics Electrostatic Potential and Capacitance 2021 Short 3M CBSE
Calculate the voltage needed to balance an oil drop carrying 10 electrons, between capacitor plates 5 mm apart. Mass = 3×10⁻¹⁶ kg, e = 1.6×10⁻¹⁹ C, g = 9.8 m/s².
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#7 Class 12 Physics Electrostatic Potential and Capacitance 2023 Short 3M CBSE
An electric field E = 50î + 75ĵ N/C exists in a region. Presuming potential at origin to be zero, find the potential at point P(1 m, 2 m).
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#8 Class 12 Physics Electrostatic Potential and Capacitance 2022 Short 3M CBSE
A short electric dipole has dipole moment 16×10⁻⁹ C·m. Find the electric potential at a point 0.6 m from centre, on a line making 60° with the dipole axis.
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#9 Class 12 Physics Electrostatic Potential and Capacitance 2023 Short 5M CBSE
Derive the expression for the electric potential due to an electric dipole at an axial point.
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#10 Class 12 Physics Electrostatic Potential and Capacitance 2022 Short 3M CBSE
Calculate the potential at the centre of a square ABCD of each side √2 m due to charges 2, −2, −3 and 6 µC at the four corners.
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#11 Class 12 Physics Electrostatic Potential and Capacitance 2021 Short 3M CBSE
(A) Calculate the potential at point P due to charge 4×10⁻⁷ C located 9 cm away. (B) Obtain the work done in bringing charge 2×10⁻⁹ C from infinity to point P. Does the answer depend on the path?
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#12 Class 12 Physics Electrostatic Potential and Capacitance 2020 Short 3M CBSE
What do you mean by polar molecules? What happens to them when electric field is applied?
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#13 Class 12 Physics Electrostatic Potential and Capacitance 2021 Short 3M CBSE
Two charged spherical conductors of radii R₁ and R₂ are connected by a conducting wire. Find the ratio of their surface charge densities in terms of their radii.
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#14 Class 12 Physics Electrostatic Potential and Capacitance 2022 Long 5M CBSE
How does electric potential vary from point to point due to a thin charged spherical shell? Draw a graph showing variation of potential with distance.
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#15 Class 12 Physics Electrostatic Potential and Capacitance 2023 Long 5M CBSE
Write the working principle of a parallel plate capacitor. On what factors does the capacitance of a parallel plate capacitor depend?
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#16 Class 12 Physics Electrostatic Potential and Capacitance 2019 Short 3M CBSE
Show that the capacitance of a spherical capacitor is more than that of a spherical conductor.
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#17 Class 12 Physics Electrostatic Potential and Capacitance 2020 Short 3M CBSE
Show that the capacitance of an insulated spherical conductor is directly proportional to the radius of the spherical conductor.
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#18 Class 12 Physics Electrostatic Potential and Capacitance 2021 Short 3M CBSE
Why does the electric field inside a dielectric decrease when it is placed in an external electric field?
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#19 Class 12 Physics Electrostatic Potential and Capacitance 2022 Short 5M CBSE
A capacitor of capacity C₁ is charged to potential V₀. On disconnecting the battery, it is connected with uncharged capacitor C₂. Find the ratio of energies before and after connection of switch S.
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#20 Class 12 Physics Electrostatic Potential and Capacitance 2024 Short 5M CBSE
Obtain the equivalent capacitance of the network shown in figure. For a 300 V supply, determine the charge on each capacitor.
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