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.
e
You might also like to view...
Collisions between galaxies tend to destroy, not create, stars
Indicate whether the statement is true or false
An object moves at a constant velocity of 12 m/s to the southwest for an interval of 20 s. Halfway through this interval, what is the magnitude of its instantaneous velocity?
a. It can be any value from 0 to 24 m/s. b. 6 m/s c. 12 m/s d. More information is needed.
A "larger" Moon on the horizon is an optical illusion
a. True b. False Indicate whether the statement is true or false
How far does a beam of light travel in 2.0 ms? (c = 3.0 × 108 m/s)
A) 6.0 × 105 m B) 0.66 × 105 m C) 90 m D) 70 m E) 60 m