10) Two parallel metal plates separated by a distance, d, have a potential difference, V, across them. The work needed to moved a charge Q from the plate at lower potential to the one at higher potential is W. How much work would be required to move twice as much charge from one plate to the other if the plates were separated by twice the distance. higher potential plate Q lower potential plate A) W/2 B) W C) 2W D) 4W 11) A proton is accelerated through a potential difference of 1 MV. Which of the following gives the correct gain in kinetic energy of the electron in both joules and electronvolts? Joule / J Electonvolt / eV A) 10' 10" B) 1.6 x 10 0 10 10" 1.6 x 10-0) D) 1.6 x 10-) 1.6 x 10-1) 12) The force between two point charges is F. If one of the charges were doubled and the distance between the charges were halved, what would be new force between charges. A) F/2 B) F C) 4F D) BF 13) A 5C charge is moved against a constant electric field of 20 N/C through a distance of 2m. What are the amount of work done, and the change in electric potential for the charge? Work Done Change in Electric Potential A) 200 J 40 V B) 100 J 40 V 200 J 20 V D) 100 J 20 V14) A wire made of material A is connected in series to a wire made of material B. Both materials are metals with electrons as charge carriers. The wires have a cell connected across them causing a current to flow. Material A has twice the number of charge carriers per unit volume than does material- B. The wires have a circular cross-sectional area, and the wire made of material A has twice the radius as the wire made of material B. What is the ratio drift velocity in wire made of material A drill velocity of wire nude of material B' A) 1/8 B) 1/4 C) 1/2 b) 1 15) Given that n is the number of charge carriers per unit volume, q is the charge per charge carrier, I is current, A is cross-sectional area, and vo is the drift velocity, what will be the volume of a cylindrical metal wire that will be transversed by the average charge carrier in one second? A) nq B) C) Vad D) nA1) Determine the equivalent resistance between the points x and y below. 40 140 120 60 A) 20 B) 30 C) 40 D) 60 2) Which statement best identifies resistivity? A) A quantity that expresses the amount of resistance per unit length for a wire B) A quantity that expresses the amount of resistance per unit length for a substance C) A quantity which is a measure of how well a substance obstructs current D) A quantity that depends on the length and cross-sectional area of a wire 3) A maleable piece of wire of length, L, has a resistance R and cross-sectional area A. The wire is stretched to 4X its length while maintaining a uniform but smaller cross-sectional area. It is then cut in half, and these two pieces are joined in parallel. The total resistance of this parallel configuration will be A) R B) 2R C) 4R D) BR4) Two cylindrical wires are connected in parallel. One wire has length, L, diameter, D. resistivity, p, and resistance R. The other has length, 2L, diameter, 2D, and resistivity, 2p L P D 2p 2D 2L Which is the total resistance of the wires in parallel? A) B) C) R D) 2R 5) The current-voltage characteristics of a resistor, R and an element, x, in a circuit are shown in the graph. 1.0 0.9 0.5 04 10 15 20 25 30 35 40 45 Which are the correct values of the resistances of R and X when the voltage is 30 volts? R (Ohms) x (Ohms) A) 0.02 30 8) 0.02 60 C) 50 30 D) 50 606) A resistor, R, and another element X are connect in series as shown. The current through R is 0.2 amperes. 0.2 A R X B The graph below shows the current-voltage characteristics of X and R. 01 10 35 45 What is the voltage across A and B? A) 5 V B) 10 V C) 15 V D) 20 V