Page 29 - 10-phy-13 Electrostatics

13. Electrostatics eLearn.Punjab

13.4 What is gold leaf electroscope? Discuss its working principle with a labeled diagram.
13.5 Suppose you have a glass rod which becomes positively charged when you rub it with

13.6 wool. Describe how would you charge the electroscope (i) negatively (ii) positively
13.7 With the help of electroscope how can you find presence of charge on a body.
Describe how you would determine the nature of the charge on a body by using
13.8
13.9 electroscope.
13.10 Explain Coulomb’s law of electrostatics and write its mathematical form.
13.11 What is meant by electric field and electric intensity?
13.12 Is electric intensity a vector quantity? What will be its direction?
How would you define potential difference between two points? Define its unit.
13.13 Show that potential difference can be described as energy transfer per unit charge
13.14
between the two points.
13.15 What do you mean by the capacitance of a capacitor? Define units of capacitance.
13.16 Derive the formula for the equivalent capacitance for a series combination of a number
13.17
13.18 of capacitors.
13.19 Describe the two different types of capacitors.
What is difference between variable and fixed type capacitor?
Enlist some uses of capacitors.
Discuss one application of static electricity.
What are hazards of static electricity?

CONCEPTUAL QUESTIONS

13.1 A charged rod attracts pieces of paper. After a while these pieces fly away! Why?
13.2 How much negative charge has been removed from a positively charged electroscope,
if it has a charge of 7.5 × 10-11 C?
13.3 In what direction will a positively charged particle move in an electric field?
13.4 Does each capacitor carry equal charge in series combination? Explain.
13.5 Each capacitor in parallel combination has equal potential difference between its two
plates. Justify the statement.
13.6 Perhaps you have seen a gasoline truck trailing a metal chain beneath it. What purpose
does the chain serve?
13.7 If a high-voltage power line falls across your car while you are in the car, why should
you not come out of the car?
13.8 Explain why, a glass rod can be charged by rubbing when held by hand but an iron rod
cannot be charged by rubbing, if held by hand?

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