CBSE Physics Electrostatics Expected Questions : Unit I
Q. 31. What is the smallest charge according to recent theory ?
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Q. 32. A bird is perched on a bare high power line but nothing happens to him. If a man standing on the earth touches the same wire gets a fatal shock. Why ?
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Q. 33. Can two similarly charged balls attract each other ?
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Q. 34. What is an ideal dipole ? What is its unit ?
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Q. 35. What is approximate capacitance of the earth ?
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Short Answer Type Question
Q. 1. What are conductors and insulators ?
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Q. 2. What is discrete nature of charge or quantization of charge ?
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Q. 3. What is conservation of charge ?
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Q. 4. State Coulomb’s Law. Give its vector form.
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Q. 5. What is a uniform electric field ? An electric dipole free to move in an electric field is plated at an angle with the uniform field. Find the torque experienced by the dipole. When it is maximum and minimum ?
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Q. 6. Determine the capacity of a parallel plate capacitor.
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Q. 7. Define electric lines of force. What are their properties ?
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Q. 8. An electric technician requires a capacitance of 2µF in a circuit across a P.D. of 1 kV. A large number of 1µF capacitors are available to him each of which can withstand a P.D. of not more than 400 V. Suggest a possible arrangement that requires a minimum number of capacitors.
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Q. 9. Define equipotential surfaces. Show that in the region of strong electric fields, eqisipotential surfaces are close together and in the regions of weaker fields, they are far apart. Show that E _l_ dr.
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Q. 10. Estimate the area of a plate of a parallel plate condenser of capacitance of IF. Hence show that it is a very big unit to be realised in practice. Given d = l mm.
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