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Consider two copper wires with the same cross-sectional area. Wire A is twice as long as wire B. How do the resistivities and resistances of the two wires compare? Check all that apply. Check all that apply.

Wire B has twice the resistance of wire A. Wire A has twice the resistance of wire B. Wire A has twice the resistivity of wire B. Wire B has twice the resistivity of wire A. Wire A and wire B have the same resistance. Wire A and wire B have the same resistivity.

Part B Which of the following statements are true? Check all that apply. Check all that apply.

The resistance of a conductor is proportional to the resistivity of the material of which the conductor is composed. A material that obeys Ohm’s law reasonably well is called an /ohmic conductor/ or a /linear conductor/. The resistance of a conductor is proportional to the conductivity of the material of which the conductor is composed. Good conductors of electricity have larger conductivity values than insulators. Semiconductors have resistivity values that are larger than those of insulators.

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Part C Which of the following will increase the resistance of a wire? Check all that apply. Check all that apply.

Decreasing the cross-sectional area of the wire will increase the resistance of the wire. Increasing the length of the wire will increase the resistance of the wire. Increasing the cross-sectional area of the wire will increase the resistance of the wire. Decreasing the resistivity of the material the wire is composed of will increase the resistance of the wire. Decreasing the length of the wire will increase the resistance of the wire. Increasing the resistivity of the material the wire is composed of will increase the resistance of the wire.

Part D Which of the following statements are true? Check all that apply. Check all that apply.

In order to maintain a steady flow of current in a conductor, a steady force must be maintained on the mobile charges. By convention, the direction of a current is taken to be the direction of flow for negative charges. In a circuit, current is delivered by the positive terminal of a battery, and it is used up by the time it returns to the negative terminal of the battery. Current is the total amount of charge that passes through a conductor’s full cross section at any point per unit of time. When an electric field is applied to a conductor, the free electrons move only in the direction opposite the applied electric field.

Part E Which of the following statements are true? Check all that apply. Check all that apply.

A battery is a device that produces electricity by transforming chemical energy into electrical energy. A battery does work on electric charges to bring them to a position of higher electric potential energy so that they can flow through a circuit to a lower potential energy. The potential difference between the terminals of a battery, when no current flows to an external circuit, is referred to as the /terminal voltage/. The internal resistance of a battery decreases with decreasing temperature.

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