The diameter of a 12-gauge copper wire is 0.081 in. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A. At this current, what is the drift velocity of the electrons?
The number of electron carriers in 1.0 cm3 of copper is 8.5 × 1022 and e = 1.60 × 10-19 C.
A) 0.044 mm/s
B) 0.44 mm/s
C) 0.44 cm/s
D) 0.44 m/s
E) 4.4 cm/s
Answer: B
You might also like to view...
Galvanized steel is coated with the metal _________.
Fill in the blank(s) with the appropriate word(s).
Hubble's law can be applied to measure the distance of the constellation of Orion.
Answer the following statement true (T) or false (F)
What causes X-ray bursters?
A) The binary companion of a neutron star spirals in and combines with the neutron star. B) The mass of an accreting neutron star passes a critical threshold between 2 and 3 Msun and explodes. C) Helium fusion, which occurs when the thin layer of accreted material on a neutron star reaches 100 million K D) The rapid rotation of the neutron star causes it to fly apart.
Two parallel square metal plates, 8.4 cm on each side, are 2.5 mm apart and carry equal but opposite charge uniformly distributed over their facing surfaces
How much excess charge is there on each plate if the electric field between the plates has a magnitude of 2.0 × 106 N/C? (k = 1/4??0 = 8.99 × 109 N ? m2/C2 )