Multiple Choice and Numerical Response Test Number 226 Please do not write in this question booklet. Choose the best answer for each question. 1 . Which of the following is represented by a scalar field? A. The magnetic field that surrounds a current-carrying wire B. The influence of a positively charged sphere on a proton C. The Earth's gravitational influence on a small mass . The intensity of light near a light bulb Use the following information to answer the next question When a charged rod is close to a neutral electroscope, the leaves of the electroscope are observed to spread apart. Charged rod knob Answer leaves numericals right on the sheet 2. While the charged rod is held close to the knob of the electroscope, one can infer that A. both the leaves and the knob have a charge opposite to that of the rod B. only the leaves have a charge similar to that of the rod C. only the leaves have a charge opposite to that of the rod D. both the leaves and the knob have a charge similar to that of the rod 3. A metal sphere "A" has an initial electrostatic charge of -2.82 x 10- C. This sphere is brought into contact with an identical neutral conducting sphere, "B". If sphere "B" is removed, what is the electric field 2.20 x 10 m to the right of sphere "A"? A. 5.76 x 107 N/C [left] C. 2.62 x 10 " N/C [left] B. 5.76 x 10' N/C [right] D. 2.62 x 10 " N/C [right] Numeric Response #1 A 3.6 HC charge is accelerated through a voltage of 120 V. The work done on the charge by the voltage is a.b x 10-J. The values of a, b and care , and (Record all three-digits in the numerical-response section on the answer sheet) as a b c Version: B