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

CBSE Physics Electrostatics Expected Questions for Quick Revision : Unit I

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Short/V. Short Questions i.e. 1-2 Marks Questions

1. Name two basic properties of electric charge.
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2. The electric potential at 0 - 9 m from a point charge is + 50 V. Find the magnitude and nature of the charge.
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3. Small ozone layer on the top of atmosphere is crucial for human survival. Why ?
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4. Sketch lines of force due to point charges (i) q < 0 ; (ii) q > 0.
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5. Define dielectric constant in terms of capacitance of a capacitor.
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6. The total energy of an electron in the first excited state of the hydrogen atom is about 3.4 eV. What is K.E. of the electron in this state ?
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7. A charge of 24 //C is given to a hollow metallic sphere of radius 0 • 2 m. Find the potential at ((") the surface of the sphere ; and (ii) at the centre of the sphere.
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8. Draw lines of force to represent uniform electric field.
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9. What is meant by quantization of charge ?
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10. How much energy will be stored by a capacitor of 470 µF capacity when charged by a battery of 20 V?
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11. Two charges of+5µC and-5µf Care placed l nm apart. Calculate the dipole moment.
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12. State Coulomb’s law of force between two electric charges. Write down the relation between electric field and electric potential at a point.
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13. Define S.I unit of electric bharge.
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14. Show that JC-1 and volt are unit of the same physical quantity.
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15. Define electric potential. Is it a vector or a scalar quanity ?
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16. Write down the physical quantity which has CV^-1 as its S.I unit. Is it a scalar or a vector quantity ?
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17. What is a dipole ? Give the unit of dipole moment.
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18. Find the electric field between two metal plates 3 mm apart connected to a 12 V battery.
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19. The work done in moving a charge 3 C between two points is 6 J. What is the potential difference between them ?
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20. What is the energy gained by an electron beam when accelerating by a P.D. of 2,000 V ?
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21. Calculate energy given to an electron when accelerating by a P.D. of 2,000 V ?
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