14. When a positively charged object is used to charge a neutral conduction
sphere by contact, the resulting charges will be
A. The sphere is now neutral and the object is negative
B. The sphere is now positive and the object is negative
C. Both the sphere and the object are negative
D. Both the sphere and the object are positive
15. Which of the following groups of materials are considered good conductors?
A. glass, rubber, aluminum, ceramic, copper
B. glass, rubber, ceramic, dry wood
C. silver, rubber, aluminum, ceramic, wet wood
D. aluminum, copper, gold, silver​