10A
YOUR ANSWER:
The specific resistance of a material is the resistance of any amount of
(From P1-21A)
that material at 20 degrees centigrade.
No. You have the right temperature but the rest of the answer is wrong. Remember, resistance is
determined by the length and cross-sectional area too. What this answer implies is that the resistance of a copper
wire one foot long and one inch in diameter would be the same as the resistance of a copper wire ten feet long and
two inches in diameter, and we both know that this isn't true. Specific resistance is the resistance of a particular
amount of a material at a temperature of 20 degrees centigrade. Now go back to Page 1-21A and choose the
correct answer.
10B
YOUR ANSWER:
The resistance would stay the same.
(From P1-2A)
Maybe you didn't understand the question. If a conductor four inches long and one inch in diameter had a
resistance of 8 ohms and we stretched it out to 8 inches, it would be longer. Since the resistance varies directly
with the length of a conductor and we made it longer, the resistance would have to increase. Also, when we
stretched it out, its diameter decreased. Since the resistance varies inversely with the cross-sectional area and we
decreased the cross-sectional area, we caused the resistance to increase. Go back to Page 1-2A and choose
another answer.
IT0340
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