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Three of these are wrong. Find the one that holds.

Exercise and reference answers

Questions
  1. Question
    Three of these statements about emf are false.
    Choices
    1. Item
      It is work per unit charge
      Correct
      Yes
    2. Explanation
      Your syllabus says emf is NOT a force.
      Item
      It is a force measured in newtons
    3. Explanation
      Only in an OPEN circuit, with no current drawn.
      Item
      It equals terminal voltage under load
    4. Explanation
      emf belongs to the source, not the circuit.
      Item
      It depends on the external resistance
  2. Question
    Three of these statements about Ohm's law are false.
    Choices
    1. Item
      It is not a fundamental law of nature
      Correct
      Yes
    2. Explanation
      Rectifiers and GaAs do not.
      Item
      Every substance obeys it
    3. Explanation
      The chapter lists three failure modes.
      Item
      It cannot fail
    4. Explanation
      Resistivity comes from R = ρl/A, a separate relation.
      Item
      It defines resistivity

Explanation

Each trap is a genuine misconception the chapter warns about. Source: syllabus Physics Part I, Ch 3 Current Electricity.
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