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Electric Potential Difference (Voltage). Ohm's Law

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Electrodynamics Learning Material
Tutorial IDTitleTutorialVideo
Tutorial		Revision
Notes		Revision
Questions
15.3Electric Potential Difference (Voltage). Ohm's Law

Electric Potential Difference (Voltage). Ohm's Law Revision Questions

1. 70 % of electric energy produced by a 12 V battery is converted into heat energy in a resistor. What is the resistance of the resistor if 28 C of charge flow through the circuit in 7 seconds?

  1. 2.1 Ω
  2. 3.0 Ω
  3. 4.0 Ω
  4. 48.0 Ω

Correct Answer: A

2. A positive test charge is brought from R1 = 6 m to R2 = 2 m away from a point charge that produces an electric field around it. What is the magnitude of charge if the potential difference between the two given points is 3000 V? Take k = 9 × 109 N ∙ m2 / C2.

  1. 27 μC
  2. 9 μC
  3. 3 μC
  4. 1 μC

Correct Answer: D

3. The current flowing through a circuit supplied by a 12 V battery is 6A and the internal resistance is 0.2 Ω. What is the resistance R of the resistor? Neglect the resistance of the wire.

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  1. 2 Ω
  2. 1.8 Ω
  3. 2.2 Ω
  4. 0.4 Ω

Correct Answer: B

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