Gauss's Law and Coulomb's Law
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Questions and Answers

What is the change in potential energy defined as?

  • The work done in going from point a to point b (correct)
  • The sum of little bits of work
  • The force acting on an object
  • The displacement of the object

    • In what scenario can the potential U at a point be defined?

  • If the force is repulsive
  • If the force is non-conservative
  • If the force is conservative (correct)
  • If the force is attractive

    • What kind of force is the electrostatic force, and how can it be represented?

  • Non-conservative, represented by potential energy
  • Conservative, represented by potential energy (correct)
  • Non-conservative, not represented by potential energy
  • Conservative, not represented by potential energy

    • What is the work done in bringing a unit charge from infinity to a distance R from a fixed charge q?

    <p>$-qE$</p> Signup and view all the answers

    What is the phenomenon called that allows light to travel along a bent fibre optic cable?

    <p>Total internal reflection</p> Signup and view all the answers

    At what temperature does an object emit red hot light?

    <p>Around 800°C</p> Signup and view all the answers

    What does the critical angle (θc) obey in the phenomenon of total internal reflection?

    <p>$n_1 \sin θ_c = n_2 \sin 90°$</p> Signup and view all the answers

    In which way does matter interact with light when it releases energy as light?

    <p>Emission</p> Signup and view all the answers

    At what temperature does water turn to steam?

    <p>373K</p> Signup and view all the answers

    What is the unit of work in the International System of Units (SI)?

    <p>Joule</p> Signup and view all the answers

    What is the mechanical equivalent of 1 calorie in Joules?

    <p>4.186 Joule</p> Signup and view all the answers

    What is the lowest temperature that has ever been achieved?

    <p>10-7 K</p> Signup and view all the answers

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