Consider two copper wires of equal length. One wire has twice the cross-sectional area of the other. How do the resistances of these two wires compare?
A) The thicker wire has twice the resistance of the thinner wire.
B) The thicker wire has eight times the resistance of the thinner wire.
C) The thicker wire has one-half the resistance of the thinner wire.
D) The thicker wire has four times the resistance of the thinner wire.
E) The thicker wire has one-fourth the resistance of the thinner wire.
Question 2
If the length and diameter of a wire of circular cross section are both tripled, the resistance will be
A) unchanged.
B) increased by a factor of 9.
C) 1/3 of what it originally was.
D) 1/9 of what it originally was.
E) tripled.
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