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Electric Current. Current Density

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15.1Electric Current. Current Density

Electric Current. Current Density Revision Questions

1. A 3 C charge flows through a point of a conductor in 2 minutes. What is the current density flowing through a 4 cm2 frame?

  1. 0.025 A/m2
  2. 6.25 A/m2
  3. 62.5 A/m2
  4. 625 A/m2

Correct Answer: C

2. The cube shown in the figure is charged with a 12 μC/cm2 uniform surface charge.

Physics Tutorials: This image provides visual information for the physics tutorial Electric Current. Current Density

A metal wire extends along the path a-b-c-d. What is the amount of current flowing through the wire if the current's velocity is 2 × 108 m/s? Assume all charge on the cube flows through the wire.

  1. 96000 A
  2. 96 A
  3. 28.8 A
  4. 288000 A

Correct Answer: A

3. A conducting wire is charged by a volume charge density of 12000 C/m3. What is the current flowing through the wire if electrons have a drift velocity of 3 mm/s? Take the wire's thickness equal to 6 mm2.

  1. 3.6 × 10-2 A
  2. 2.16 × 10-4 A
  3. 21.6 A
  4. 36 A

Correct Answer: B

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