Use the figure at the right for problems 1 - 3 For the circuit consisting of air

Question

Use the figure at the right for problems 1 - 3 For the circuit consisting of air filled, parallel plate capacitors, C_1 = 4.36 mu F, C_1 = 6.72 mu F, C_3 = 7.76 mu F, C_4 = 8.50 mu F C_5 = 9.50 mu F and C_6 = 12.5 mu F, connected as shown at the right. Determine the equivalent capacitance between points A and B. (a) 3.78 mu F. (b) 4.68 mu F. (c) 5.27 mu F. (d) 6.52 mu F. (e) 7.03 mu F. (f) ____ C_2 is now removed from the circuit and a potential difference of 7.0 volts is applied across it. What charge will be C_2? (a) 11.1 mu C. (b) 23.6 mu C. (c) 47.0 mu C. (d) 69.5 mu C. (e) 95.4 mu C. (f) ____ A material of dielectric constant 4.8 is placed so as to completely fill between the plates of capacitor C_4. The value of the capacitance of C_4 is (a) 36.1 mu F. (b) 52.5 mu F. (c) 60.0 mu F. (d)72.6 mu C. (e) 91.8 mu F. (f) ____ A insulating material has a dielectric strength of 38 kV/mm. If the thickness of martial is 68.6 mm, what is the maximum potential difference that can be applied across it before it is damaged? (a) 1.88 MV. (b) 2.11 MV. (c) 2.61 MV. (d) 3.14 MV. (e) 4.22 MV. (f) ____. Circle the correct word/words in the parentheses to complete each sentence. (a) To measure electric current in a device in an electric circuit, an Ammeter must be connected in (series, parallel) with the device. (b) A (semiconductor, superconductor) is a material that loses all electrical resistance below a certain temperature referred in as the critical temperature. (c) "Doping" refers to a process of adding a (small, large) amount of "impurity" atoms to a material to change its electrical properties. (d) To measure electric potential difference across a device in an electric circuit, a voltmeter must be corrected in (series, parallel) with the device. (e) If a dielectric material is placed in an electric filed, electric dipoles (are formed, are destroyed) in the material. A certain solid cylindrical wire has a diameter of 5.55 mm and it is connected in a circuit. The resulting current density in it is 498 A/m^2. What is the current in it at that time? (a) 3.94 mA. (b) 9.66 mA. (c) 12.0 mA. (d) 16.5 mA. (e) 26.8 mA. (f) ____ A certain wire has electrical resistivity = 5.56 times 10^-4 (Ohm m) at room temperature. If its length is 550 m and it has a circular cross section of radius = 0.78 mm, what is its electrical resistance at room temperature? (a) 8.81 Ohm. (b) 11.5 Ohm. (c) 16.0 Ohm. (d) 21.3 Ohm. (e) 28.5 Ohm. (f) ____ For the circuit shown, R_1 = 25.6 Ohm, R_2 = 32.8 Ohm, R_3 = 47.5 Ohm R_4 = 58.2 Ohm R_5 = 79.7 Ohm and R_6 = 83.9 Ohm. Determine the equivalent resistance between A and B. (a) 11.5 Ohm. (b) 39.7 Ohm. (c) 57.2 Ohm. (d) 72.7 Ohm. (e) 98.4 Ohm. (f) ____ For the circuit at the right R_1 = 35.0 Ohm, R_2 = 45.0 Ohm, R_3 = 82.0 Ohm, epsilom_1 = 9.0 V and epsilom_2 = 4.0 V. Determine the power in resistor R_2. (a) 0.00 m W. (b) 2.41 m W. (c) 14.3 m W. (d) 38.1 m W. (f) ____

Explanation / Answer

(6) #1

C1, C2 and C3 are in series =====> 1/C123 = 1/C1 + 1/C2 + 1/C3

                                         C123 = 1.97 uF

C4, C5 and C6 are in series =====> 1/C456 = 1/C4 + 1/C5 + 1/C6

                                         C456 = 3.3 uF

Now C123 and C456 are in parallel =====> C = C123 + C456 = 5.27 uF (Option C)

#2) charge across C2 = Q2 = C2/V = 6.72/7 = 0.96 uC

#3) New capacitance of C6 = 12.5*4.8 = 60 uF

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