Author Question: When there is electric current through a metal wire, the moving charges are A) only protons. B) ... (Read 152 times)

Engineer · **on:** Jul 29, 2018

When there is electric current through a metal wire, the moving charges are

A) only protons.
B) only electrons.
C) both protons and electrons.
D) positive metal ions.
E) negative metal ions.

Question 2

Motor oil, with a viscosity of 0.25 N s/m2, is flowing through a tube that has a radius of 5.0 mm and is 25 cm long. The drop in pressure is 300 kPa. What is the volume of oil flowing through the tube per second?

A) 0.00038 m3/s
B) 0.025 m3/s
C) 0.0012 m3/s
D) 4.7 m3/s
E) 7.5 m3/s