Two coins carry identical charges. These two coins are lying 2.50 m apart on a table. If each of these coins experiences a force of 2.00 N, how large is the charge on each coin?
A) 2.61 ?C
B) 26.1 ?C
C) 6.67 ?C
D) 5.22 ?C
E) 52.2 ?C
E
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Resistance and Resistivity: The resistance of a 100-cm wire of cross sectional area 2 × 10-6 m2 is 400 ?. What is the resistivity of the material from which this wire is made?
A. 0.80 × 10-4 ? ? m B. 8.0 × 10-4 ? ? m C. 0.80 × 10-5 ? ? m D. 0.80 × 10-6 ? ? m E. 8.0 × 10-6 ?v
During which step in the website plan shown above would you determine the website's goals and objectives?
A. Step 1 B. Step 2 C. Step 3 D. Step 4
The cores of the terrestrial worlds are made mostly of metal because
A) the terrestrial worlds as a whole are made mostly of metal. B) metals sunk to the centers a long time ago when the interiors were molten throughout. C) the core contained lots of radioactive elements that decayed into metals. D) over billions of years, convection gradually brought dense metals downward to the core.
An uncharged conductor has a hollow cavity inside of it. Within this cavity there is a charge of +10 µC that does not touch the conductor. There are no other charges in the vicinity
Which statement about this conductor is true? (There may be more than one correct choice.) A) The inner surface of the conductor carries a charge of -10 µC and its outer surface carries no excess charge. B) The inner and outer surfaces of the conductor each contain charges of -5 µC. C) The net electric field within the material of the conductor points away from the +10 µC charge. D) The outer surface of the conductor contains +10 µC of charge and the inner surface contains -10 µC. E) Both surfaces of the conductor carry no excess charge because the conductor is uncharged.