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» CBSE Physics Electrostatics Expected Questions for Quick Revision : Unit I : CBSE Sample Question Papers

CBSE Physics Electrostatics Expected Questions for Quick Revision : Unit I

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3 Marks Questions (Derivation Type and Problems)

1. Define the unit of capacitance. Calculate the total work done in imparting a maximum charge Q to the plates of a parallel plate capacitor.
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2. Derive an expression for the equivalent capacity of two capaitors of capacitance C1 and C2 connected in series.
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3. Define the term electric dipole moment. Derive an expressionfor the total work done in rotating the dipole through an angle 9 in a uniform electric field E.
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4. A parallel plate capacitor has two identical plates each of area A separated by a distance d. The space between plates is filled by a dielectric medium. Derive the expression for the capacitance of the capacitor.
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5. Define capacitance. Give its unit. Two capacitors of equal capacitance when connected in series have net capacitance Cs and Cp when connected in parallel. What is the value of Cs/Cp ?
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6. The total energy of an electron in the first excited state of the H-atom is -3.4 eV. What is the value of the potential and kinetic energies of the electron in this state ?
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7. A capacitor is charged to a potential V1. The power supply is disconnected and capacitor is connected in parallel to another uncharged capacitor. Derive the expression for common potential of the combination of capacitor. Show that the total energy of the combination is less than the sum of energy stored in them before they are connected.
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8. Calculate the capacitance of a capacity C in the figure if the equivalent capacitance of the combination between A and B is 15/iF.
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9. Explain the principle of capacitor. Derive an expression for parallel plate capacitor.
2
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10. A 80µF capacitor is charged by a 50V battery. The capacitor is disconnected from the battery and then connected across another uncharged 320µF capacitor. Calculate the charge on second capacitor. .
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11. Derive an expression for the electric field intensity at any point along the axial line of an electric dipole.
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12. A charge of 12/J.C is given to a hollow metallic sphere of radius 0-1 m. Find the potential at (1) surface of the sphere and («) at the centre of the sphere.
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