Unit 2 Test 1402Question 1What is the internal resistance of an automobile battery that has an emf of 12.0 V and a terminal voltage of 15.0 V while current of 8.50 A is charging it?Answer: 0.395Question 2What is the sensitivity of the galvanometer (that is, what current gives a full-scale deflection) inside a voltmeter that has a 33.5 k-ohms resistance on its 200 V scale?Answer: 6e-3Question 3A cosmic ray electron moves at 7.75 x 106 m/s perpendicular to the earth's magnetic field at an altitude where field strength is 1.20 x 10-5 T. What is the radius of the circular path the electron follows?Answer: 3.68 mQuestion 4The wire carrying 350 A to the motor of a commuter train feels an attractive force of 3.40 x 10-3 N/m due to a parallel wire carrying 5.00 A to a headlight. How far apart are the wires?Answer: .103 mQuestion 5Calculate the peak voltage of a generator that rotates its 195 turn, 0.100 m diameter coil at 3600 rpm in a 0.770 T field.Answer: 450 VQuestion 6An LC circuit consists of a 3.00 mH inductor and a 5.00 AuF capacitor. Find its impedance at 60.0 Hz.Answer: 530 ohmsQuestion 7A balloon will stick to a wooden wall if the balloon is chargedSelect one:a. negativelyb. either c. positivelyd. neitherQuestion 8Every proton in the universe is surrounded by its ownSelect one:a. electric fieldb. None of thesec. both of these d. gravitational fieldQuestion 9In a common dc circuit, electrons move at speeds of Select one:a. they do not move.b. the speed of a sound wave.c. a fraction of a centimeter per second. d. the speed of light.e. many centimeters per second.Question 10The metal detectors that TSA makes people walk through at airports operate viaSelect one:a. Newton's Lawsb. Coulomb's Lawc. Boren's Law (There really is such a law)d. Ohm's Lawe. Faraday's Law Question 11A step-up transformer has a ratio of one to ten. If 100 W of power go into the primary coil, the power coming from the secondary coil isSelect one:a. 1 Wb. 10 Wc. 1000 Wd. 100
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