Author Question: To increase the current density in a wire of length l and diameter D, you can a. decrease the ... (Read 139 times)

savannahhooper

  • Hero Member
  • *****
  • Posts: 576
To increase the current density in a wire of length l and diameter D, you can
 a. decrease the potential difference between the two ends of the wire. b. increase the potential difference between the two ends of the wire. c. decrease the magnitude of the electric field in the wire. d. heat the wire to a higher temperature. e. combine both (b) and (d).

Question 2

The electron density in copper is 8.49  1028 electrons/m3 . The electron charge is e = -1.60  10-19 C. When a 1.00 A current is present in a copper wire with a 0.40 cm2 cross-section, the electron drift velocity, in m/s, with direction defined relative to the current density, is
 a. -1.84  10-6.
  b. +1.84  10-6.
  c. -1.84.
  d. -5.43  105.
  e. +5.43  105.



vickybb89

  • Sr. Member
  • ****
  • Posts: 347
Answer to Question 1

B

Answer to Question 2

A



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

Did you know?

The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

Did you know?

Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

Did you know?

More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

Did you know?

In 1864, the first barbiturate (barbituric acid) was synthesized.

For a complete list of videos, visit our video library