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NCERT Class 12 Physics Chapters
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1.
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A polythene piece rubbed with wool is found to have a negative charge of 8 × 10‒10C. What is the number of electrons transferred?
(a) 2 × 1010; polythene to wool (b) 5 × 109; polythene to wool
(c) 5 × 109; wool to polythene (d) 2 × 1010; wool to polythene
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2.
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A positively charged glass rod attracts an object. The object must be :
(a) negatively charged (b) Neutral
(c) either negatively charged or neutral (d) a magnet
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3.
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The number of electrons in one coulomb of electric charge is :
(a) 6.25×10-18 (b) 6.25×1018 (c) 1.6×10-19 (d) 1.6×10+19
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4.
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Two point charges +4 μC and - 2 μC are placed at a certain distance in air. They experience an attractive force F. If they are brought in contact with each other and then separated to the same distance, the new repulsive force between them will be :
(a) 8F (b) 4F (c) F/8 (d) F/4
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5. Two identical conducting balls A and B have charges - Q and +3Q respectively. They are brought in contact with each other and then separated by a distance d apart. Find the nature of the Coulomb force between them. (CBSE 2019, 1M, with Optional Question)
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6. Derive the expression for the torque acting on an electric dipole, when it is held in a uniform electric field. Identify the orientation of the dipole in the electric field, in which it attains a stable equilibrium.
(CBSE 2020, 2M, with Optional Question)
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7. Two charged conducting spheres of radii a and b are connected to each other by a wire. Find the ratio of the electric fields at their surfaces.
(CBSE 2023, 2M, with Optional Question)
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8. Two long straight parallel conductors carrying currents, exert a force on each other. Why ?
Derive an expression for the force per unit length between two long straight parallel conductors carrying currents in opposite directions. Explain the nature of the force between these conductors.
(CBSE 2024, 3M)
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NCERT Science Subjects
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Unit Name
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Sub Areas of Chapter 1 Electric Charges and Fields
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Electric Charges And Fields
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1.1 Introduction
1.2 Electric Charge 1.3 Conductors and Insulators 1.4 Basic Properties of Electric Charge
1.5 Coulomb’s Law
1.6 Forces between Multiple Charges
1.7 Electric Field
1.8 Electric Field Lines
1.9 Electric Flux
1.10 Electric Dipole (The field of an electric dipole)
1.11 Dipole in a Uniform External Field
1.12 Continuous Charge Distribution
1.13 Gauss’s Law
1.14 Applications of Gauss’s Law
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