EXAM 1

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Dec 6, 2023

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Question 1 5 / 5 pts How many electrons are needed to form a charge of –2.00 nC? 1.25x10 10 electrons Question 2 5 / 5 pts If 1.80x10 20 electrons move through a pocket calculator during a full day’s operation, how many coulombs of charge moved through it? -28.8 C Question 3 5 / 5 pts How strong is the attractive force between a glass rod with a 0.700 µC charge and a silk cloth with a -0.600 µC charge, which are 12.0 cm apart, using the approximation that they act like point charges? 0.262 N Question 4 5 / 5 pts How far apart must two point charges of 75.0 nC (typical of static electricity) be to have a force of 1.00 N between them? 7.11 mm Question 5 5 / 5 pts What is the magnitude of an electric field that exerts a 2.00x10 5 N force on a -1.75 µC charge? 11.4 N/C Question 6 5 / 5 pts Electric Field Lines Point away from positive charges and towards negative charges. Question 7 5 / 5 pts A bare helium nucleus has two positive charges and a mass of 6.64x10 -27 kg. Calculate its kinetic energy in joules at 2.00% of the speed of light.
1.20x10 -13 J Question 8 5 / 5 pts What is the strength of the electric field between two parallel conducting plates separated by 1.00 cm and having a potential difference (voltage) between them of 1.50x10 4 V? 1.50x10 6 N/C Question 9 5 / 5 pts An electron is to be accelerated in a uniform electric field having a strength of 2.00x10 6 V/m. What energy in keV is given to the electron if it is accelerated through 0.400 m? 800 keV Question 10 5 / 5 pts What total capacitances can you make by connecting a 10.0 µF and a 16.0 µF capacitor together? 6.15 µF and 26.0 µF Question 11 5 / 5 pts What is the energy stored in the 10.0 µF capacitor of a heart defibrillator charged to 9.00x10 3 V? 405 J Question 12 5 / 5 pts Equipotential line are always perpendicular to electric field lines. Question 13 5 / 5 pts A total of 600 C of charge passes through a flashlight in 0.500 h. What is the average current? 333 Ma Question 14 5 / 5 pts
The 200-A current through a spark plug moves 0.300 mC of charge. How long does the spark las 1.50 µs Question 15 5 / 5 pts What current flows through the bulb of a 3.00-V flashlight when its hot resistance is 3.60 Ω? 0.833 A Question 16 5 / 5 pts To what temperature must you raise a copper wire, originally at 20.0°C, to double its resistance, neglecting any changes in dimensions? (For Copper: = 1.72 x 10 -8 Ω ∙ m and = 3.9 x 10 -3 /°C 276° C Question 17 5 / 5 pts What power is supplied to the starter motor of a large truck that draws 250 A of current from a 24.0-V battery hookup? ! 6.00 kW Question 18 5 / 5 pts A charge of 4.00 C passes through a pocket calculator’s solar cells in 4.00 h. What is the power output, given the calculator’s voltage output is 3.00 V? 833 µW Question 19 5 / 5 pts A certain circuit breaker trips when the rms current is 15.0 A. What is the corresponding peak current? 21.2 A Question 20 5 / 5 pts
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Some makes of older cars have 6.00-V electrical systems. What is the hot resistance of a 30.0-W headlight in such a car? 1.20 Ω

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