Electricity and Resistance Relationships Quiz
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Questions and Answers

What is the physical quantity that can be measured by a voltmeter?

  • Potential difference
  • Voltage (correct)
  • Electromotive force
  • Internal resistance

    • In an opened circuit where there is no current flow, what is the reading of the voltmeter equivalent to?

  • Voltage drop
  • Electromotive force (correct)
  • Internal resistance
  • Charge

    • What happens to the voltmeter reading in a closed circuit with current flow compared to the reading in an opened circuit?

  • It fluctuates
  • It remains the same
  • It decreases (correct)
  • It increases

    • What is the formula that relates voltage, current, and internal resistance in a circuit?

    <p>$V = -Ir + Ԑ$</p> Signup and view all the answers

    When current is zero in a circuit, what is the value of the effective internal resistance?

    <p>$re = r + r + r + r$</p> Signup and view all the answers

    What is the relationship between the gradient of a voltage-current graph and the internal resistance?

    <p>$m = -r$</p> Signup and view all the answers

    How does connecting dry cells in parallel affect the effective internal resistance?

    <p>It increases</p> Signup and view all the answers

    What happens to the reading of a voltmeter when there is current flow in a circuit?

    <p>It decreases due to potential difference lost across internal resistance</p> Signup and view all the answers

    How does connecting dry cells in series impact total emf and effective internal resistance according to the text?

    <p>Both total emf and effective internal resistance increase</p> Signup and view all the answers

    When the number of turns of the solenoid is high, what can be said about the deflection of the galvanometer pointer?

    <p>It is high</p> Signup and view all the answers

    In the context of the diagrams, what happens to the rate of cutting of the magnetic flux when the number of turns of the solenoid is low?

    <p>It decreases</p> Signup and view all the answers

    If there is an increase in the rate of cutting of magnetic flux, what can be expected to happen to the magnitude of induced current produced?

    <p>It increases</p> Signup and view all the answers

    In Diagram 4.2, what can be inferred about the relationship between the number of turns of the solenoid and the deflection of the galvanometer pointer?

    <p>They are directly proportional</p> Signup and view all the answers

    When a bar magnet is pushed into two identical solenoids, what magnetic pole is present at end P according to Diagram 4.1?

    <p>North (N)</p> Signup and view all the answers

    What is the impact on the strength of the magnetic field when there are more bar magnets present?

    <p>It increases</p> Signup and view all the answers

    How does a change in the strength of the magnetic field affect the deflection of the galvanometer?

    <p>Increases deflection</p> Signup and view all the answers

    'Faraday’s Law' is associated with which aspect observed in Diagram 4.2?

    <p>'Rate of cutting of magnetic flux and induced current' relationship</p> Signup and view all the answers

    What can be concluded about the relationship between the number of magnets and galvanometer deflection?

    <p>'Their relationship is directly proportional'</p> Signup and view all the answers

    Which diagram displays a scenario where 'rate of cutting of magnetic flux' increases?

    <p>Diagram 4.2</p> Signup and view all the answers

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