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#1 Class 12 Physics Current Electricity 2017 Mcq 1M CBSE
Beams of electrons and protons move parallel to each other in the same direction. They
A. attract each other
B. repel each other
C. neither attract nor repel
D. force depends upon speed of beams
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#2 Class 12 Physics Current Electricity 2018 Mcq 1M CBSE
Pieces of copper and silicon are initially at room temperature. Both are heated to temperature $T$. The conductivity of
A. both increases
B. both decreases
C. copper increases and silicon decreases
D. copper decreases and silicon increases
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#3 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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#4 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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#5 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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#6 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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#7 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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#8 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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#9 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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#10 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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#11 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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#12 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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#13 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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#14 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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#15 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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#16 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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#17 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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#18 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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#19 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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#20 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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