Jadeen Says That You Can Increase the Resistance of a Copper

question 9

Multiple Choice

Jadeen says that you can increase the resistance of a copper wire by hammering the wire to make it narrower and longer. Arnell says that you can increase its resistance by heating the wire. Which one, if either, is correct, and why?

• A) Arnell, because the conductivity of the wire increases when it is heated.
• B) Arnell, because the conductivity of the wire decreases when it is heated.
• C) Jadeen, because the conductivity of a wire is directly proportional to its area and inversely proportional to its length.
• D) Jadeen, because the conductivity of a copper wire does not increase when it is hammered.
• E) Both are correct because (b) and (d) are both correct.

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Definitions:

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The risk faced by multinational companies that financial statements in foreign currencies may fluctuate due to changes in exchange rates.

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An index representing the performance of 500 large companies listed on stock exchanges in the United States.

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A theoretical bundle of investments that includes every available asset in the market, weighted by market capitalization.