1Which of the following statements is true about current? Select your answer. It moves from a low electric potential to a high electric potential. Its 51 unit is coulomb per square meter {g} or ampere per second (g). It is the rer},F slow motion of moving charges due to the stead].r electric force. It is the net charge owing through an area per unit time. Haw much current, in nlamperes, is present in a clapper wire if 2.155 C of charge passes thmugh it in 6 minutes? Select your answer. 1.35 136 2.25 044 How 1113113.F eleetl'ene are present in a wire if a 1.53; current passes through the conductor in 2 minutes? Select your answer. 1.13 x 1031 5.12 x 1013 1.33 x 101\" 5.53 x 102" What is the current density, in my; in an aluminum wire used in transmission lines, if it has a diameter of 5.1 cm and carries a steady current of 920 A? Select your answer. 5.74 x 10 1.80 x 102 4.50 x 105 4.50 x 102A 12-gauge copper wire, used in household wirings, has a diameter of 3.31 mm?, which carries 4.20 A of current. What is the drift speed of the electrons, in , assuming that each copper atom contributes one conduction electron? Select your answer. 8.85 x 10-17 6.32 x 10-11 7.93 x 10 24 9.34 x 10 5What would be the drift speed of electrons, in , if the same diameter of the aluminum wire from the previous item was used instead of copper? Select your answer. 1.32 x 10-4 1.32 x 10-2 7.29 x 1013 7.29 x 1011Consider a currentcarrying conductor 1(with a erossseolion that gradually becomes larger. Ho's.T does the drift velocity of the electrons 1wary in this wire? Select your answer. It slows down. It speeds up. It remains constant. It changes randomly. 1iJ'Ili'hat happens to the current density and the drift velocity of electrons if the current carried by a conductor is double while all other variables remain constant? Select your answer. The current density remains constant while the drift velocity doubles. Both the current density and the drift velocity doubles. The current density doubles while the drift velocity remains constant. Both the current and the drift velocity is halved. Which of the following refers to the opposition of a material to electric current? Select your answer. conductivity current density resistivity resistanceWhich of the following is the SI unit for resistivity? Select your answer. S/m V/AGiven their resistivity values, which among the materials below will be considered as the best electrical conductor? A. 100 x 10 8/C B. 75 x 1010 /oc C. 1.47 x 10 8 /C D. 3.5 x 10 5/C Select your answer. A C D BWhat is the resistivity of an unknown alloy if it is subjected to an electric field of 120 V/m, and has a current density of 0.052 A/m?? Select your answer. 2.31 x 102 0.m 4.33 x 10 0.m 6.24 0.m 1.20 x 103 0.mAluminum, which is used in transmission lines, has a resistance of 2.7 0 at 20 "C. What is its resistance, in ohms, if it was subjected to a 40 "C temperature? Select your answer. 2.9 1.2 3.2 18An unknown alloy has a resistance of 75-5 0 at room temperature (20 'C). If the same metal wire has a resistance of 77.0 0 at 90 "C, what would be the wire's resistance, in ohms, if the temperature is at -10.0 "C? Select your answer. 70.0 69.5 73-3 74.9Material X is considered as a very good conductor. Which of the following statements correctly describe its property? Select your answer. It has a very love.T conductivity. It is inexpensive and noncorrosive. It has a very love.T density. It has a very love.T resistivity. Why are metals commonly categorized as good electrical conductors? Select your answer. Metals have high resistance and low conductance, Metals have more compact structure. Metals have atoms that 1ii'ilzlrate in its place. Metals have plenty of free electrons. The resistivity of a material was plotted against temperature as shown in the graph below. Which of the following It's resistivity decreases with increasing temperature. statements best describes the resistivity of the material? It's resistivity reaches zero with increasing T temperature. It's resistivity stays constant with increasing temperature. It's resistivity increases with increasing temperature. Answer OWhich of the following statements correctly explain why resistance increases with increasing temperature for most metals? Select your answer. The amplitude of the atom's vibrations increases, hindering the flow of charges. All charges move randomly; hence, there is no flow of charges. The number of "free" electrons increases; thus, increasing the current. The atoms in the material remain in their position due to their compact and stable arrangement