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

Physics & Space Science

You might also like to view...

At the chemical composition of iron and 4.26 weight percent carbon and a temperature of 1153°C, there is a(n) _________reaction.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

If you were on the moon during a total lunar eclipse, the sun would be hidden behind Earth

Indicate whether the statement is true or false

Physics & Space Science

Coulomb's Law: Two tiny particles having charges of +7.00 ?C and -9.00 ?C are placed along the y-axis. The +7.00-µC particle is at y = 0.00 cm, and the other particle is at y = 40.00 cm. Where must a third charged particle be placed along the y-axis so that it does not experience any net electric force due to the other two particles?

A. 0.200 m B. 2.99 m C. -0.187 m D. -2.99 m E. 0.187 m

Physics & Space Science

A certain photon after being scattered from a free electron at rest moves at an angle of 120° with respect to the incident direction. If the wavelength of the incident photon is 0.591 nm, what is the wavelength of the scattered photon?

A) 0.380 nm B) 0 nm C) 0.550 nm D) 0.591 nm E) 0.595 nm

Physics & Space Science