d) 8 V 2. A 14-gauge copper wire has a cross section area of 2.081 mm2. The resi
ID: 1584446 • Letter: D
Question
d) 8 V 2. A 14-gauge copper wire has a cross section area of 2.081 mm2. The resistivity of copper at 20 °C is 1.7x10-8 m. The temperature coefficient of copper is 3.9 x 10-3 K-. The resistance of 100 meters of 14 gauge copper wire at 100°C is: a) 0.82 b)1.07 d) 100 MS 3. In a fluorescent tube, 2.5 x 1018 electrons flow through a cross-sectional area each second. The current in the tube is a) 0.4 A c) 40 A b) 4 A 4. When two capacitors are connected in series, the resultant capacitance a) is greater than the capacitance of the bigger capacitor. b) is less than individual capacitance of any one of them c) is the average of the two capacitances. d) is the sum of the two capacitances. 5, A 0.22 f capacitor is charged to 100V. The energy stored in the capacitor is a) 1.1x103 c) 2.2 x 103j. b) 1.1 x 10 j. d) 2.2 x 10%. -5 ra of 0.8 m2 separated by a 0.6 mm tor isExplanation / Answer
Current is the charge flowing per secong
I = dq/dt
I = 2.5*10^18*1.6*10^-19 / 1
= 0.4A
so option A) 0.4 A is the correct answer
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