Resistance and Resistivity: When a 1.0-m length of metal wire is connected to a 1.5-V battery, a current of 8.0 mA flows through it. What is the diameter of the wire? The resistivity of the metal is 2.24 × 10-8 ? ? m.
A. 12 ?m
B. 6.0 ?m
C. 24 ?m
D. 2.2 ?m
Answer: A
You might also like to view...
The rms speed of a certain sample of carbon dioxide molecules, with a molecular weight of 44.0 g/mole, is 396 m/s. What is the rms speed of water vapor molecules, with a molecular weight of 18.0 g/mol, at the same temperature as the carbon dioxide?
A) 253 m/s B) 387 m/s C) 421 m/s D) 506 m/s E) 619 m/s
Two long parallel wires 45.6 cm apart are carrying currents of 13.0 A and 23.0 A in the same direction. What is the magnitude of the magnetic field halfway between the wires?
a. 8.77E–6 T b. 3.16E–5 T c. 1.14E–5 T d. 2.02E–5 T e. 4.39E–6 T
Water is flowing through a pipe with a constriction. The area of the narrow section is one-half the area of the wide section. If the velocity of the incompressible fluid is 3.2 m/s in the narrow section, then what is the velocity of the fluid in the wide section?
A. 0.9 m/s B. 1.0 m/s C. 1.6 m/s D. 1.8 m/s E. 1.9 m/s
Pluto was discovered in
A) ancient times. B) 1789. C) 1859. D) 1930. E) 1992.