الفيزياء العامة الجزء الثاني#موقع الفيزياء.كوم

Multiple choice question for part 2
[7] Find the equivalent capacitance between points a and b in the
combination of capacitors shown in Figure 3.
aa
6uF
7uF
Ab
3uF
4uF
Figure 3
a. 1.12 F
b. 1.94 F
c. 1.12 F
d. 20.0 F
[8] The inner conductor of a coaxial cable has a radius of 0.500 mm, and the
outer conductor's inside radius is 4.00 mm. The space between the
conductors is filled with polyethylene, which has a dielectric constant of
2.30 and a dielectric strength of 20.0 10 6 V/m. What is the maximum
potential difference that this cable can withstand?
a. 30.4 kV
b. 70.0 kV
c. 20.8 kV
d. 166 kV
[9] Two capacitors when connected in parallel give an equivalent
capacitance of 27.0 pF and give an equivalent capacitance of 4.00 pF when
connected in series. What is the capacitance of each capacitor?
a. 10.4 pF, 16.6 pF
b. 9.76 pF, 44.2 pF
c. 9.77 pF, 17.23 pF
d. 4.88 pF, 22.12 pF
[10] An isolated capacitor of unknown capacitance has been charged to a
potential difference of 100 V. When the charged capacitor is then connected
in parallel to an unchanged 10.0 F capacitor, the voltage across the
combination is 30.0 V. Calculate the unknown capacitance.
a. 7.00 F
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