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Electric Resistance. Combinations of Resistors

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Electrodynamics Learning Material
Tutorial IDTitleTutorialVideo
Tutorial		Revision
Notes		Revision
Questions
15.2Electric Resistance. Combinations of Resistors

Electric Resistance. Combinations of Resistors Revision Questions

1. What is the length of a 2 mm2 copper wire whose resistance at 20°C is 0.05Ω? Take the resistivity of copper as 1.69 × 10-8 Ω ∙ m.

  1. 59 cm
  2. 59 m
  3. 592 m
  4. 5.917 m

Correct Answer: D

2. Calculate the equivalent resistance of the combined setup shown in the figure if all resistors are identical, R = 12 Ω each.

Physics Tutorials: This image provides visual information for the physics tutorial Electric Resistance. Combinations of Resistors
  1. 13.3 Ω
  2. 37.3 Ω
  3. 96 Ω
  4. 42 Ω

Correct Answer: B

3. What is the final temperature of a tungsten wire inside a light bulb if its resistance increases by 5 percent to the resistance at the reference temperature? Temperature coefficient of resistance for tungsten is 0.0044 K-1.

  1. 41°C
  2. 11.36°C
  3. 31.36°C
  4. 21°C

Correct Answer: C

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