Two charged objects attract one another with a force F. If the charge on both objects is doubled and the distance between them is also doubled, what will be the force between them?
[Ques. 2] Rank the following five capacitors from greatest to smallest capacitance, noting any cases of equality.
(a) a 20-F capacitor with a 4-V potential difference between its plates
(b) a 30-F capacitor with charges of magnitude 90 C on each plate
(c) a capacitor with charges of magnitude 80 C on its plates, differing by 2 V in potential,
(d) a 10-F capacitor storing energy 125 J
(e) a capacitor storing energy 250 J with a 10-V potential difference
1.e > a > b > d > c
2.e > d > a > b > c
3.c > b > a > d > e
4.b > a = c > d = e
[Ques. 3] State the law of signs for electric charges.
[Ques. 4] If three unequal capacitors, initially uncharged, are connected in series across a battery, which of the following statements is true?
1.The equivalent capacitance is greater than any of the individual capacitances.
2.The largest voltage appears across the smallest capacitance.
3.The largest voltage appears across the largest capacitance.
4.The capacitor with the largest capacitance has the greatest charge.
5.The capacitor with the smallest capacitance has the smallest charge.
[Ques. 5] How many different kinds of charges did you observe the effects of in this experiment?
[Ques. 6] A capacitor with very large capacitance is in series with another capacitor with very small capacitance. What is the equivalent capacitance of the combination?
1.slightly greater than the capacitance of the large capacitor
2.slightly less than the capacitance of the large capacitor
3.slightly greater than the capacitance of the small capacitor
4.slightly less than the capacitance of the small capacitor
[Ques. 7] What kind of a charge can be placed on an electroscope by induction using a glass rod rubbed with silk? Explain.
[Ques. 8] An electronics technician wishes to construct a parallel plate capacitor using rutile ( = 100) as the dielectric. The area of the plates is 1.00 cm2. What is the capacitance if the rutile thickness is 1.00 mm?
1.8.5 pF
2.177 pF
3.8.85 F
4.100 F
5.35.4 F
[Ques. 9] Determine the charge on the wool or fur after it has been used to rub a rubber rod.
[Ques. 10] By what factor is the capacitance of a metal sphere multiplied if its volume is tripled?
1.3
2.31/3
3.1
4.3-1/3
5.13
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