Author Question: If a metallic wire of cross-sectional area 3.0 10-6 m2 carries a current of 9.1 A and has a mobile ... (Read 119 times)

azncindy619 · **on:** Jul 28, 2018

If a metallic wire of cross-sectional area 3.0 10-6 m2 carries a current of 9.1 A and has a mobile charge density of 4.24 1028 carriers/m3, what is the average drift velocity of the mobile charge carriers? (charge value = 1.6 10-19 C)
a. 3.4 103 m/s
c. 4.5 10-4 m/s
b. 1.7 103 m/s
d. 1.5 10-4 m/s

Question 2

A rod of length L is hinged at one end. The moment of inertia as the rod rotates around that hinge is ML2/3 . Suppose a 2.50 m rod with a mass of 3.00 kg is hinged at one end and is held in a horizontal position. The rod is released as the free end is allowed to fall. What is the angular acceleration as it is released?
a. 3.70 rad/s2
c. 5.88 rad/s2
b. 7.35 rad/s2
d. 4.90 rad/s2