Unit 1 TestPHYS 1402Question 1Point charges of 21.0 uC and 42.0 uC are placed 0.500 m apart.At what point along the line connecting them (from the smaller charge) is the electric field zero?Answer:0.207Question 2Point charges of 21.0 uC and 42.0 uC are placed 0.500 m apart.What is the magnitude of the electric field halfway between them?Example for exponents format:1.037e+02Answer:3.02e6Question 3Point charges of 21.0 uC are placed 0.500 m apart.What is the direction of the magnetic field halfway between them?Select one:a. toward the larger chargeb. toward the smaller charge c. perpendicular to both chargesQuestion 4A 1.50 V battery supplies 0.200 W of power to a small flashlight for 15.0 minutes. How much charge (in C) does it move?Answer:120Question 5A 1.50 V battery supplies 0.200 W of power to a small flashlight for 15.0 minutes.How many electrons must move to carry this charge?Answer:7.5e20Question 6A doubly charged ion is accelerated to an energy of 36.0 keV by the electric field between two parallel plates separated by 1.50 cm. What is the electric field strengthbetween the plates?Answer in V/mAnswer:1.2e6Question 7How many volts are supplied to operate an indicator light on a DVD player that has aresistance of 155 ohms, given 24.5 mA passes through it?Answer in VAnswer:3.8Question 8What current flows through a 2.46 cm diameter rod of pure silicon that is 22.0 cm long, when 1000 V is applied to it? (Such a rod may be used to make nuclear particledetectors.)Answer in Amps (A)Answer: 0.000939Question 9What power is supplied to the starter motor of a large truck that draws 225 A of current from a 23.0 V battery hookup? Answer in kWAnswer:5.18Question 10Which of the following terms is used to describe a material that does not allow electrons to easily move through it?Select one:a. conductorb. resistorc. transformerd. insulator e. inductorQuestion 11Which of the following units are the SI units for the electric potential?Select one:a. ampere (A)b. newton/coulomb (N/C)c. joule (J)d. gauss (G)e. volt (V) Question 12What happens to a capacitor when an insulator is inserted between the two conductors of the capacitor?Select one:a. The capacitance of the capacitor increases. b. Electrons from the negative plate travel to the positive plate.c. The electric field inside the capacitor increasesd. There is no change to the capacitor.e. The insulator reduces the electric field betweenQuestion 13Which of the following devices is used placed into a circuit to measure the current that passes through it?Select one:a. ammeter b. gaussmeterc. voltmeterd. diffractometere. flowmeterQuestion 14Complete the following sentence: the electrical resistivity of most metal wires isSelect one:a. constant, even when the temperature of the metals varies greatly.b. independent of the length of the wirec. expressed in ohmsd. much smaller than the values for most semiconductors e. inversely proportional to the cross-sectional area of the